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2,919 Animals, page 1 of 2
- W-Marked Cutworm: Spaelotis clanestina, Spaelotis havilae
- Wabash Pigtoe: Fusconaia flava
- Wabash Riffleshell: Epioblasma sampsonii
- Wabash River Cruiser: Macromia taeniolata
- Waccamaw Crayfish: Procambarus braswelli
- Waccamaw Darter: Etheostoma perlongum
- Waccamaw Fatmucket: Lampsilis fullerkati
- Waccamaw Killifish: Fundulus waccamensis
- Waccamaw Silverside: Menidia extensa
- Waccamaw Spike: Elliptio waccamawensis
- Waccamaw White Miller: Nectopsyche waccamawensis
- Wachna Cod: Eleginus gracilis, Eleginus nawaga
- Wafer: Centriscus scutatus
- Wafer Shrimpfish: Centriscus cristatus
- Wagner’s Bonneted Bat: Eumops glaucinus
- Wagner’s Gerbil: Gerbillus dasyurus
- Wagner’s Mastiff-Bat: Eumops glaucinus
- Wagner’s Mustached Bat: Pteronotus personatus
- Wagner’s Sac-Winged Bat: Cormura brevirostris
- Wagner’s Viper: Vipera wagneri
- Wahkeena Creek Amphipod: Stygobromus wahkeenensis
- Wahkeena Falls Flightless Stonefly: Zapada wahkeena
- Wahlberg’s Eagle: Aquila wahlbergi
- Wahlberg’s Epauletted Fruit Bat: Epomophorus wahlbergi
- Wahlberg’s Honeyguide: Prodotiscus regulus
- Wahnes’s Parotia: Parotia wahnesi
- Wahoo: Acanthocybium solandri
- Wahoo Fish: Acanthocybium solandri
- Wahrindi: Synodontis schall
- Waianae Megalagrion Damselfly: Megalagrion amaurodytum waianaenum
- Waigen Sea-Perch: Psammoperca waigiensis
- Waigeo Cuscus: Spilocuscus papuensis
- Waigeo Rainbowfish: Melanotaenia catherinae
- waigeo Silverside: Atherinomorus vaigiensis
- Waigeu Drummer: Kyphosus vaigiensis
- Waigeu Perch: Psammoperca waigiensis
- Waigeu Sea Perch: Psammoperca waigiensis
- Waigeu Seaperch: Psammoperca waigiensis
- Waigeu Snapper: Lutjanus fulvus
- Waigieu Seaperch: Psammoperca waigiensis
- Waikiki Cardinalfish: Apogonichthys perdix
- Wailing Frog: Cyclorana vagitus
- Waite’s Flounder: Arnoglossus waitei
- Waite’s Lefteye Flounder: Arnoglossus waitei
- Waite’s Splitfin: Luzonichthys waitei
- Waiter Daggerwing: Marpesia zerynthia, Marpesia zerynthia dentigera
- Waites Deepsea Dogfish: Centroscymnus plunketi
- Wakasagi: Hypomesus nipponensis
- Wake Island Rail: Gallirallus wakensis
- Wake Rail: Gallirallus wakensis
- Wakulla Springs Vari-Colored Microcaddisfly: Hydroptila wakulla
- Walbeehm’s Sharp-Nosed Shark: Rhizoprionodon acutus
- Walden’s Hornbill: Aceros waldeni
- Waldrapp: Geronticus eremita
- Walia Ibex: Capra walie
- Walker Peaclam: Pisidium walkeri
- Walker’s Anchovy: Anchoa walkeri
- Walker’s Darner: Aeshna walkeri
- Walker’s Katydid: Inscudderia walkeri
- Walker’s Killi: Fundulopanchax walkeri
- Walker’s Mealybug: Dysmicoccus walkeri
- Walker’s Metalmark: Apodemia walkeri, Apodemia walkerii
- Walker’s Toadfish: Batrachoides walkeri
- Walker’s Tusked Sprawler: Anthopotamus verticis
- Walker’s Ground Cricket: Allonemobius walkeri
- Walking Catfish: Clarias batrachus, Clarias brachysoma, Clarias fuscus
- Walking Cicada: Okanagana synodica
- Walking Goby: Scartelaos histophorus, Tellinella incerta
- Walking Seahare: Aplysia juliana
- walking Snakehead: Channa orientalis
- Walking Thread-legged Katydid: Arethaea ambulator
- Walkingstick: Diapheromera femorata
- wall Wrasse: Halichoeres hortulanus
- Wall-Eye Pullack: Theragra chalcogramma
- Wall-Eyed Pickerel: Sander vitreus
- Wall-Eyed Pike: Sander vitreus
- Wall-Eyed Pike-Perch: Sander vitreus
- Wallabies: Macropus giganteus, Macropus robustus
- Wallaby Tick: Haemaphysalis bancrofti
- Wallace’s Cave Beetle: Pseudanophthalmus wallacei
- Wallace’s Dasyure: Myoictis wallacii
- Wallace’s Deepwater Mayfly: Anepeorus simplex, Spinadis simplex
- Wallace’s Fruit-Dove: Ptilinopus wallacii
- Wallace’s Giant Bee: Chalicodoma pluto
- Wallace’s Hanging-Parrot: Loriculus flosculus
- Wallace’s Hawk-Eagle: Spizaetus nanus
- Wallace’s Longwing: Heliconius wallacei
- Wallace’s Owlet-Nightjar: Aegotheles wallacii
- Wallace’s Scops-Owl: Otus silvicola
- Wallago: Wallago attu
- Wallaroo: Macropus robustus
- Wallaroos: Macropus giganteus, Macropus robustus
- Wallengren’s Copper: Trimenia wallengrenii
- Walleye: Sander vitreus
- Walleye Pike: Sander vitreus
- Walleye Pollock: Theragra chalcogramma
- Walleye Seaperch: Hyperprosopon argenteum
- Walleye Surfperch: Hyperprosopon argenteum
- Walleyed Pike: Sander vitreus
- Walleyed Pollock: Theragra chalcogramma
- Walliacke: Lutjanus synagris
- Wallum Froglet: Crinia tinnula
- Walnut Canyon Talussnail: Sonorella coltoniana
- Walnut Caterpillar: Datana integerrima
- Walnut Caterpillar Moth: Datana integerrima
- Walnut Elimia: Elimia bellula
- Walnut Husk Fly: Rhagoletis completa
- Walnut Lace Bug: Corythucha juglandis
- Walnut Scale: Diaspidiotus juglansregiae
- Walnut Shoot Moth: Acrobasis demotella
- Walnut Sphinx: Ambulyx tenimberi
- Walnut Twig Beetle: Pityophthorus juglandis
- Walrus: Odobenus rosmarus, Odobenus rosmarus divergens, Odobenus rosmarus rosmarus
- Walsh’s Locust: Melanoplus walshii
- Walter’s Toadfish: Batrachoides waltersi
- Walters’ Saturnia Moth: Saturnia walterorum
- Walton’s Mudskipper: Periophthalmus waltoni
- Walvis Bay Reds: Dentex macrophthalmus
- Wami Tilapia: Oreochromis urolepis, Oreochromis urolepis hornorum, Oreochromis urolepis urolepis
- Wampoo Fruit-Dove: Ptilinopus magnificus
- Wampum Tuskshell: Antalis pretiosum
- Wanderer: Pareronia anais
- Wandering Albatross: Diomedea exulans
- Wandering Brocade: Oligia illocata
- Wandering Bumblebee: Bombus vagans
- Wandering Cleaner Wrasse: Diproctacanthus xanthurus
- Wandering Garter Snake: Thamnophis elegans vagrans
- Wandering Glider: Pantala flavescens
- Wandering Globe: Mesodon altivagus
- Wandering Hairysnail: Trichotropis migrans
- Wandering Heath: Erica vagans
- Wandering Oodemas Weevil: Oodemas erro
- Wandering Salamander: Aneides vagrans
- Wandering Shrew: Mammila simiae, Sorex vagrans
- Wandering Skipper: Panoquina errans
- Wandering Small-Eared Shrew: Cryptotis montivaga
- Wandering Snag: Gastrocopta servilis
- Wandering Tattler: Heteroscelus incanus
- Wandering Tiger Moth: Spilosoma vagans
- Wandering Whelk: Buccinum planeticum
- Wandering Whistling-Duck: Dendrocygna arcuata
- Wanieso Lizardfish: Saurida wanieso
- Wapiti: Cervus elaphus, Cervus elaphus affinis, Cervus elaphus alashanicus, Cervus elaphus barbarus, Cervus elaphus elaphus, Cervus elaphus hanglu, Cervus elaphus nannodes, Cervus elaphus nelsoni
- Wapiti Or Elk: Cervus elaphus affinis, Cervus elaphus barbarus, Cervus elaphus hanglu, Cervus elaphus nannodes, Cervus elaphus nelsoni
- Warabi: Petrogale burbidgei
- Waratah Scale: Pseudaulacaspis eugeniae
- Warbler Finch: Certhidea olivacea
- Warbling Silverbill: Lonchura malabarica
- Warbling Vireo: Vireo gilvus
- Ward Pandora: Pandora wardiana
- Ward’s Amphipod: Stygobromus wardi
- Ward’s Damsel: Pomacentrus wardi
- Ward’s Field Mouse: Apodemus wardi
- Ward’s Flycatcher: Pseudobias wardi
- Ward’s Short-Tailed Shrew: Blarinella wardi
- Ward’s Sleeper: Valenciennea wardii
- Ward’s Tilefish: Branchiostegus wardi
- Ward’s Trogon: Harpactes wardi
- Wards Wobbegong: Orectolobus wardi
- Warehouse Beetle: Trogoderma variabile
- Warehouse Pirate Bug: Xylocoris flavipes
- Warm Spring Zaitzevian Riffle Beetle: Zaitzevia thermae
- Warm Springs Amargosa Pupfish: Cyprinodon nevadensis pectoralis
- Warm Springs Pupfish: Cyprinodon nevadensis pectoralis
- Warming’s Lantern Fish: Ceratoscopelus warmingii
- Warming’s Lanternfish: Ceratoscopelus warmingii
- Warmouth: Lepomis gulosus
- Warner Springs Shoulderband: Rothelix warnerfontis
- Warner Sucker: Catostomus warnerensis
- Warner Valley Bewick’s Wren: Thryomanes bewickii atrestus
- Waroo: Uaru amphiacanthoides
- Warpaint Shiner: Luxilus coccogenis
- Warped Whelk: Pyrulofusus deformis
- Warragul Burrowing Crayfish: Engaeus sternalis
- Warren Island Dusky Shrew: Sorex monticolus malitiosus
- Warren’s Collar Weevil: Hylobius warreni
- Warren’s Sawfly: Neodiprion warreni
- Warren’s Spiny Rat: Proechimys warreni
- Warrior Darter: Etheostoma bellator
- Warrior Pigtoe: Pleurobema rubellum
- Warrior Shiner: Lythrurus alegnotus
- warrior Swimming Crab: Callinectes bellicosus
- Warsangli Linnet: Carduelis johannis
- Warsaw Grouper: Epinephelus nigritus
- Warsaw-Black Jewfish: Epinephelus nigritus
- Wart Butterfish: Psenopsis anomala
- Wart Hog: Phacochoerus aethiopicus, Phacochoerus aethiopicus aethiopicus, Phacochoerus africanus
- Wart Sea Snake: Acrochordus granulatus
- Wart-Biter (Bush-cricket): Decticus verrucivorus verrucivorus
- Wart-Lipped Mullet: Crenimugil crenilabis
- warted Seadevil: Cryptopsaras couesii
- Warteye Stargazer: Gillellus uranidea
- Warthead Blenny: Protemblemaria bicirrus
- Warthead Goby: Ideogorgia capensis, Paragobiodon modestus
- Warthead Sculpin: Myoxocephalus niger
- Warthog: Phacochoerus africanus
- Warthog Flounder: Engyprosopon grandisquama
- Wartneck Piddock: Chaceia ovoidea
- Warton’s Cave Spider: Cicurina wartoni
- wartskin Frogfish: Antennarius maculatus
- Warty Arion: Arion owenii
- Warty Bobtail Squid: Rondeletiola minor
- Warty Coqui: Eleutherodactylus locustus
- warty Crab: Eriphia gonagra
- Warty Cyclostreme: Arene bairdii
- Warty Dory: Allocyttus verrucosus
- Warty Eunicea: Eunicea calyculata
- warty Frogfish: Antennarius maculatus
- Warty Ghoul: Synanceia horrida
- Warty Jumping-Slug: Hemphillia glandulosa
- Warty Oreo: Allocyttus verrucosus
- Warty Poacher: Chesnonia verrucosa
- Warty Prowfish: Aetapcus maculatus
- Warty Rocksnail: Lithasia lima
- Warty Sculpin: Myoxocephalus scorpius, Myoxocephalus verrucosus
- Warty Sea Star: Echinaster callosus
- Warty Sea-Poacher: Chesnonia verrucosa
- Warty Seacat: Dolabrifera dolabrifera
- Warty Toad: Bufo spinulosus
- Warty Tunicate: Pyura haustor
- Warty Venus: Chione cingenda, Venus verrucosa
- Warty-Headed Goby: Paragobiodon echinocephalus, Paragobiodon echinocephalus gibbosus
- Warty-Lipped Mullet: Crenimugil crenilabis
- Wartyback: Quadrula nodulata
- Wartynosed Mullet: Crenimugil crenilabis
- Waryfish: Scopelosaurus argenteus, Scopelosaurus lepidus
- Wasatch Pika: Ochotona princeps wasatchensis
- Washboard: Megalonaias nervosa
- Washed-Out Zale: Zale metatoides
- Washeide: Erica ventricosa
- Washington Butterclam: Saxidomus gigantea
- Washington Cave Stygobromid: Stygobromus elliotti
- Washington Clam: Saxidomus nuttalli
- Washington Eriococcin: Eriococcus washingtonensis
- Washington Ground Squirrel: Spermophilus washingtoni
- Washington Hairstreak: Callophrys affinis washingtonia
- washington Lava Cave Amphipod: Stygobromus elliotti
- Washington Long-Tailed Weasel: Mustela frenata altifrontalis
- Washington Snowshoe Hare: Lepus americanus washingtonii
- Washington Southern Red-Backed Vole: Clethrionomys gapperi occidentalis
- Washington Woodeater: Xylophaga washingtona
- Wasp Goby: Chriolepis vespa
- Wasp Moth: Syntomeida melanthus
- waspfish: Notesthes robusta, Paracentropogon longispinis
- Watanabe’s Angelfish: Genicanthus watanabei
- Watchman Goby: Valenciennea strigata
- Water Beetle: Haliplus canadensis, Haliplus leopardus, Haliplus pantherinus, Hygrotus semivittatus
- Water Buffalo: Bubalus bubalis
- Water Carpet: Lampropteryx suffumata
- Water Celery: Oenanthe javanica ’Flamingo’
- Water Chevrotain: Hyemoschus aquaticus
- Water Dragon: Physignathus cocincinus
- Water Dropwort: Oenanthe javanica ’Flamingo’
- Water Flea: Daphnia jollyi, Daphnia nivalis, Daphnia occidentalis, Rhynchochydorus australiensis
- Water Frog: Rana daemeli
- Water Goldfinch: Pristella maxillaris
- Water Helmeted Toad: Caudiverbera caudiverbera
- Water Hyacinth Mirid Bug: Eccritotarsus catarinensis
- Water Jellyfish: Aequorea victoria
- Water Lettuce Weevil: Neohydronomus affinis
- Water Lily Aphid: Rhopalosiphum nymphaeae
- Water Moccasin: Agkistrodon piscivorus, Agkistrodon piscivorus piscivorus
- Water Opossum: Chironectes minimus, Chironectes minimus minimus
- Water Parsley: Oenanthe javanica ’Flamingo’
- Water Pipit: Anthus spinoletta, Anthus spinoletta alticola, Anthus spinoletta japonicus, Anthus spinoletta pacificus, Anthus spinoletta rubescens, Anthus spinoletta spinoletta
- Water Rail: Rallus aquaticus
- Water Scavenger Beetle: Crenitis digestus, Cymbiodyta acuminata, Cymbiodyta blanchardi, Cymbiodyta minima, Cymbiodyta semistriatus
- Water Shrew: Sorex palustris, Sorex palustris albibarbis, Sorex palustris punctulatus
- Water Spider: Argyroneta aquatica
- Water Strider: Rhagovelia obesa
- Water Thick-Knee: Burhinus vermiculatus
- Water Turkey: Anhinga anhinga
- Water Vole: Microtus richardsoni
- Water-Holding Frog: Cyclorana platycephala
- Waterbuck: Kobus ellipsiprymnus, Kobus ellipsiprymnus ellipsiprymnus
- Watercock: Gallicrex cinerea
- Watercress Darter: Etheostoma nuchale
- Watercress Snail: Fontigens nickliniana
- Waterdog: Necturus maculosus maculosus
- Waterfall Climbing Cave Fish: Cryptotora thamicola
- Waterfall Swift: Hydrochous gigas, Hydrochrous gigas
- Waterhouse’s Leaf-Nosed Bat: Macrotus waterhousii
- Waterhyacinth Grasshopper: Cornops aquaticum
- Waterhyacinth Mirid Bug: Eccritotarsus catarinensis
- Waterhyacinth Mite: Orthogalumna terebrantis
- Waterhyacinth Moth: Niphograpta albiguttalis, Xubida infusella
- Waterlettuce Moth: Spodoptera pectinicornis
- Waterlettuce Weevil: Neohydronomus affinis
- Waterlily Leaf Beetle: Galerucella nymphaeae
- Waterlily Leafcutter: Synclita obliteralis
- Watermelon: Katsuwonus pelamis
- Watermelon Tellin: Tellina punicea
- Waters’s Gerbil: Gerbillus watersi
- Watling Island Ground Iguana: Cyclura rileyi rileyi
- Watson Toothshell: Polyschides watsoni
- Watson Tuskshell: Rhabdus watsoni
- Watson’s Bonito: Cybiosarda elegans
- Watson’s Climbing Rat: Tylomys watsoni
- Watt’s Pipistrelle: Pipistrellus wattsi
- Wattle Honey Myrtle: Melaleuca micromera
- Wattle-Billed Bird-Of-Paradise: Loboparadisea sericea
- Wattle-Necked Softshell Turtle: Palea steindachneri
- Wattled Bats: Chalinolobus neocaledonicus
- Wattled Broadbill: Sarcophanops steerii
- Wattled Brush-Turkey: Aepypodius arfakianus
- Wattled Crane: Bugeranus carunculatus
- Wattled Curassow: Crax globulosa
- Wattled Eelpout: Cryptozona inflata, Lycodes palearis
- Wattled Guan: Aburria aburri
- Wattled Honeyeater: Foulehaio carunculatus
- Wattled Jacana: Jacana jacana
- Wattled Lapwing: Vanellus senegallus
- Wattled Ploughbill: Eulacestoma nigropectus
- Watts’s Spiny Rat: Maxomys wattsi
- Wave: Idaea obfusaria
- Waved Albatross: Phoebastria irrorata
- Waved Carpet: Hydrelia sylvata
- Waved Sphinx: Ceratomia undulosa
- Waved Umber: Menophra abruptaria
- Waved Whelk: Buccinum undatum
- Waved Woodpecker: Celeus undatus
- Wavy Amphissa: Amphissa cymata
- Wavy Astarte: Astarte undata
- Wavy Bittersweet: Glycymeris undata
- Wavy Catfish: Corydoras aeneus
- Wavy Clio: Clio recurva
- Wavy Corbula: Corbula cymella
- Wavy Crassatella: Eucrassatella fluctuata
- Wavy Dwarf-Venus: Nutricola cymata, Psephidia cymata
- Wavy Grubfish: Parapercis haackei
- Wavy Lamellaria: Velutina undata
- Wavy Liocyma: Liocyma fluctuosum
- Wavy Trophon: Boreotrophon truncatus
- Wavy Turban: Megastraea undosa
- Wavy-Back Skipjack: Euthynnus affinis
- Wavy-Edged Kellyclam: Cymatioa electilis
- Wavy-Line Astarte: Astarte esquimalti
- wavy-Lined Blenny: Entomacrodus decussatus
- Wavy-Lined Emerald: Synchlora aerata
- Wavy-Lined Greatstreak: Arcas cypria
- Wavy-Lined Grouper: Epinephelus ongus, Epinephelus undulosus
- Wavy-Lined Heterocampa: Heterocampa biundata
- Wavy-Lined Rock Cod: Epinephelus undulosus
- Wavy-rayed Lampmussel: Lampsilis fasciola, Lampsilis fasciola fasciola
- Wavyband Sole: Zebrias japonica
- Wavybanded Sole: Zebrias japonica
- Wavyline Grunt: Microlepidotus inornatus
- Wavyline Rockskipper: Entomacrodus decussatus
- Wavyrayed Lampmussel: Lampsilis fasciola, Lampsilis fasciola fasciola
- Wawona Riffle Beetle: Atractelmis wawona
- Wax Coil: Helicodiscus nummus
- Wax Dome: Ventridens cerinoideus
- Wax Heath: Erica ventricosa
- Wax Trail Eriococcin: Stibococcus cerinus
- Waxed Sphinx: Ceratomia undulosa
- Waxen Silverside: Menidia beryllina
- Waxy Drill: Urosalpinx macra
- Waxy Glass Snail: Aegopinella nitidula
- Waxy Macoma: Macoma cerina
- Waxy Mangelia: Cryoturris cerinella
- Waxy Miter: Vexillum wandoense
- Waxy Monkey Frog: Phyllomedusa sauvagii
- Waxy Solarelle: Lamellitrochus inceratus
- Waxy Tightcoil: Pristiloma gabrielinum
- Waxy Tuskshell: Antalis ceratum
- Waxy-Winged Skimmer: Orthetrum rubens
- Wayward Whelk: Colus errones
- Waziristan Snowtrout: Chlorostoma callicula, Schizocypris brucei
- Weak Lefteye Flounder: Arnoglossus debilis
- Weak Paper-Bubble: Diaphana minuta
- Weakfish: Cynoscion jamaicensis, Cynoscion regalis, Cynoscion squamipinnis
- Weasel: Mustela erminea, Mustela nivalis
- Weasel Shark: Hemigaleus microstoma
- Weasel Sportive Lemur: Lepilemur mustelinus
- Weasel-Lemur: Lepilemur mustelinus
- Weasels: Mustela macrodon
- Weather Loach: Misgurnus anguillicaudatus, Misgurnus anguillicaudatus erikssoni
- Weather-Fish: Misgurnus fossilis
- Weatherfish: Cobitis taenia taenia, Misgurnus fossilis
- Weathervane Scallop: Patinopecten caurinus
- Web Burrfish: Chilomycterus antillarum
- Web Sculpin: Hemitripterus americanus
- Web-Footed Coqui: Eleutherodactylus karlschmidti
- Web-Footed Marsh Rat: Holochilus brasiliensis
- Web-Footed Tenrec: Limnogale mergulus
- Web-Spinning Pine-Sawfly: Acantholyda hieroglyphica
- Webb’s Tufted-Tailed Rat: Eliurus webbi
- Webbed Flying Squid: Ommastrephes bartramii
- Webbed Rimula: Rimula aequisculpta
- Webbed Squid: Ommastrephes bartramii
- Webbed Star: Asterina miniata
- Webbing Clothes Moth: Tineola bisselliella
- Webbing Coneworm: Dioryctria disclusa
- Weber Oyster: Teskeyostrea weberi
- Weber’s Chromis: Chromis weberi
- Weber’s Croaker: Johnius weberi
- Weber’s Dwarf Squirrel: Prosciurillus weberi
- Weber’s Ilisha: Ilisha kampeni
- Weber’s Jewfish: Johnius weberi
- Weber’s Mudskipper: Periophthalmus weberi
- Weber’s Puller: Chromis weberi
- Webfoot Octopus: Octopus membranaceus
- Webspinning Sawfly: Cephalcia arvensis
- Webster’s Salamander: Plethodon websteri
- Webug Sucker: Catostomas fecundus
- Weddell Seal: Leptonychotes weddellii
- Weddell’s Saddle-Back Tamarin: Saguinus fuscicollis weddelli
- Wedge Leaf-Flower: Phyllanthus cuneifolius
- Wedge Picassofish: Rhinecanthus rectangulus
- Wedge Piddock: Martesia cuneiformis
- Wedge Sole: Dicologlossa cuneata
- Wedge Tellin: Tellina candeana, Tellina candeana d’Orbigny
- Wedge-Billed Hummingbird: Schistes geoffroyi
- Wedge-Billed Woodcreeper: Glyphorynchus spirurus
- Wedge-Billed Wren-Babbler: Sphenocichla humei
- Wedge-Capped Capuchin: Cebus olivaceus, Cebus olivaceus apiculatus, Cebus olivaceus nigrivittatus, Cebus olivaceus olivaceus
- Wedge-Rumped Storm-Petrel: Oceanodroma tethys, Oceanodroma tethys tethys
- Wedge-Shaped Beetle: Hesperobaenus rufipes, Macrosiagon dimidiata
- Wedge-Shaped Piddock: Martesia cuneiformis
- Wedge-Shaped Spur-Throat Grasshopper: Melanoplus cuneatus
- Wedge-Spot Damsel: Pomacentrus cuneatus
- Wedge-Tail Triggerfish: Rhinecanthus rectangulus
- Wedge-Tailed Eagle: Aquila audax
- Wedge-Tailed Green-Pigeon: Treron sphenurus
- Wedge-Tailed Hillstar: Oreotrochilus adela
- Wedge-Tailed Jery: Neomixis flavoviridis
- Wedge-Tailed Sabrewing: Campylopterus curvipennis
- Wedge-Tailed Shearwater: Puffinus pacificus
- wedge-Tailed Tang: Paracanthurus hepatus
- Wedge-Tailed Tuskfish: Choerodon sugillatum
- Wedge-Tailed Wrasse: Labropsis xanthonota
- Wedgenose Skate: Raja whitleyi
- Wedgespot Damsel: Pomacentrus cuneatus
- Wedgespot Shiner: Notropis greenei
- wedgetail Blue Tang: Paracanthurus hepatus
- Wedgetail Filefish: Paramonacanthus frenatus
- Wedgetail Triggerfish: Rhinecanthus rectangulus
- Wedgetailed Triggerfish: Rhinecanthus rectangulus
- Wedgetooth Snakemoray: Uropterygius xenodontus
- Weed Cardinalfish: Foa brachygramma
- Weed Darter: Etheostoma exile
- Weed Eel: Anguilla anguilla
- Weed Shiner: Notropis texanus
- Weedpatch Ambersnail: Catinella pugilator
- Weedsucker: Eckloniaichthys scylliorhiniceps
- Weedy Cardinalfish: Foa fo
- Weedy Scorpionfish: Rhinopias aphanes, Rhinopias frondosa, Scorpaenopsis cirrosa
- Weedy Seadragon: Phyllopteryx taeniolatus
- Weedy Stingfish: Scorpaenopsis cirrosa
- Weedy Surge Wrasse: Halichoeres margaritaceus
- Weedy Wrasse: Leptojulis cyanopleura
- Weems’ Bighorn Sheep: Ovis canadensis weemsi
- Weeper Capuchin: Cebus olivaceus
- weepicheesis: Hiodon alosoides, Pipra nettereri
- Weeping Bottlebrush: Melaleuca tamariscina
- Weeping Capuchin: Cebus olivaceus
- Weeping Paperbark: Melaleuca leucadendra
- Weeping Sandsmelt: Parapercis somaliensis
- Weeping Tea Tree: Melaleuca leucadendra
- Weeping Toado: Torquigener pleurogramma
- Weeping White Mulberry: Morus alba ’Pendula’
- Weeping Willow: Aphanipathes salix
- Weever: Echiichthys vipera
- Weevil: Camptorrhinus statua, Cossonus corticola, Curculio glandium, Curculio pardalis, Curculio proboscideus, Homorosoma chinensis, Hylobitelus xiaoi, Hylobius piceus, Isochnus populicola, Otiorhynchus raucus, Polydrusus impressifrons, Rhynchaenus fagi, Rhynchaenus subfasciatus
- Weevil Parasitoid: Catolaccus hunteri
- Weevil Wasp: Cerceris clypeata
- Wehrle’s Salamander: Plethodon wehrlei
- Weid’s Black-Tufted-Ear Marmoset: Callithrix kuhlii
- Weidemeyer’s Admiral: Limenitis weidemeyerii, Limenitis weidemeyerii oberfoelli
- Weigel’s Toad: Notaden weigeli
- Weingartner’s Cave Flatworm: Sphalloplana weingartneri
- Weiske’s Tiger: Parantica weiskei
- Weitzman’s Pearlside: Maurolicus weitzmani
- Weka: Gallirallus australis
- Weke: Mulloidichthys flavolineatus
- Weke-’ula: Bathlyagus ochotensis, Mulloidichthys vanicolensis
- Wekiu Bug: Nysius wekiuicola
- Wekiwa Hydrobe: Aphaostracon monas
- Wekiwa Siltsnail: Cincinnatia wekiwae, Floridobia wekiwae
- Welander’s Flathead: Rogadius welanderi, Semipallium wardiana
- Welch’s Grunter: Bidyanus welchi
- Welchman: Holocentrus adscensionis, Sargocentron vexillarium
- Well: Powelliphanta gilliesi, Powelliphanta lignaria
- Well-Ribbed Dovesnail: Anachis lafresnayi, Costoanachis lafresnayi
- Well-Threaded Wentletrap: Asperiscala bellastriata
- Wellenbindige Oak Splendour Beetle: Eupristocerus undatus
- Weller’s Salamander: Plethodon welleri
- Wellington Flying Squid: Nototodarus sloanii
- Wellington Shrimp: Lipkebe holthuisi
- Wells’ Coral: Coscinaraea wellsi
- Wels: Silurus glanis
- Wels Catfish: Silurus glanis
- Welsh Wave: Venusia cambrica
- Welshman: Holocentrus adscensionis
- Welwitch’s Bat: Myotis welwitschii
- Wenchman: Holocentrus adscensionis, Pristipomoides aquilonaris, Sargocentron coruscum
- Wenger Cave Stygobromid: Stygobromus wengerorum
- wenger’s Cave Amphipod: Stygobromus wengerorum
- Wengeror’s Cave Amphipod: Stygobromus wengerorum
- Wengerors’ Cave Amphipod: Stygobromus wengerorum
- Wenxian Knobby Newt: Tylototriton wenxianensis
- Weralli: Pastinachus sephen
- Werner’s Catfish: Clarias werneri
- Werner’s Killifish: Aplocheilus werneri
- Werner’s Smooth-Head: Conocara werneri
- werneri: Iriatherina werneri
- Werneria: Werneria nubigena
- west African Angelfish: Holacanthus africanus
- West African Bichir: Polypterus retropinnis
- West African Black Turtle: Pelusios niger
- West African Cat Shark: Scyliorhinus cervigoni
- West African Catshark: Scyliorhinus cervigoni
- West African Chimpanzee: Pan troglodytes verus
- West African Crowned Crane: Balearica pavonina
- West African Dwarf Crocodile: Osteolaemus tetraspis, Osteolaemus tetraspis osborni
- West African Freshwater Goby: Awaous lateristriga
- West African Goatfish: Pseudupeneus prayensis
- West African Guineafowl: Numida meleagris
- West African Hawkfish: Cirrhitus atlanticus
- West African Hinged Tortoise: Kinixys erosa
- West African Ilisha: Ilisha africana
- West African Ladyfish: Elops lacerta
- West African Long-Tailed Shrew: Crocidura muricauda
- West African Lungfish: Protopterus annectens, Protopterus annectens annectens
- west African Mackerel: Scomberomorus tritor
- West African Manatee: Trichechus senegalensis
- West African Mud Turtle: Pelusios castaneus
- West African Ostrich: Struthio camelus, Struthio camelus spatzi
- West African Pygmy Herring: Sierrathrissa leonensis, Sierrathrissa leonensisden
- west African Pygmy Shrew: Crocidura obscurior
- West African Pygmy Skate: Neoraja africana
- West African Rockhopper: Entomacrodus cadenati
- West African Seahorse: Hippocampus algiricus
- West African Shaggy Rat: Dasymys rufulus
- West African Sharpnose-Puffer: Canthigaster supramacula
- West African Skate: Bathyraja hesperafricana
- West African Spadefish: Chaetodipterus lippei
- west African Spanish Mackerel: Scomberomorus tritor
- West African Speckled Blenny: Hypleurochilus aequipinnis
- West African Stargazer: Uranoscopus cadenati
- West Australian Butterflyfish: Chaetodon assarius
- West Australian Chromis: Chromis westaustralis
- West Australian Dhufish: Glaucosoma hebraicum
- West Australian Jewfish: Glaucosoma hebraicum
- West Australian Seahorse: Hippocampus subelongatus
- West Caucasian Tur: Capra caucasica
- West Coast Klipfish: Clinus heterodon
- West Coast Lady: Vaga blackburni, Vanessa annabella
- West Coast Prickly-Apple: Harrisia aboriginum
- West Coast Seabream: Lithognathus aureti
- West Coast Snake-Eel: Mystriophis rostellatus
- West Coast Sole: Austroglossus microlepis
- West Coast Steenbras: Lithognathus aureti
- West Coast Threespine Stickleback: Gasterosteus microcephalus
- West Coast Tripletail: Lobotes pacificus
- West European Hedgehog: Erinaceus europaeus
- West Fork Shoulderband: Helminthoglypta taylori
- West Indian Alvania: Alvania auberiana
- West Indian Awningclam: Solemya occidentalis
- West Indian Bulimulus: Bulimulus guadalupensis
- West Indian Croaker: Micropogonias furnieri
- West Indian Cup-And-Saucer: Crucibulum auricula
- West Indian Dovesnail: Columbella mercatoria
- West Indian False Cerith: Batillaria minima
- West Indian Fighting Conch: Strombus pugilis
- West Indian Fruit Fly: Anastrepha crebra
- West Indian Furrow Lobster: Justitia longimanus
- West Indian Fuzzy Chiton: Acanthopleura granulata
- West Indian Green Chiton: Chiton tuberculatus
- West Indian Manatee: Trichechus manatus, Trichechus manatus latirostris
- West Indian Monk Seal: Monachus tropicalis
- West Indian Peach Scale: Pseudaulacaspis pentagona
- West Indian Pipefish: Micrognathus crinitus
- west Indian Porgy: Calamus pennatula
- West Indian Powderpost Drywood Termite: Cryptotermes brevis
- West Indian Red Scale: Selenaspidus articulatus
- West Indian Ribbed Chiton: Chaetopleura janeirensis
- West Indian Scale: Pseudaulacaspis pentagona
- West Indian Sea Cucumber: Actinopyga agassizi
- West Indian Simnia: Cymbovula acicularis
- West Indian Snapper: Lutjanus vivanus
- West Indian Starsnail: Lithopoma tectum
- West Indian Stinging Ant: Wasmannia auropunctata
- West Indian Tegula: Tegula lividomaculata
- West Indian Topsnail: Cittarium pica
- West Indian Vanikoro: Vanikoro oxychone
- West Indian Whistling-Duck: Dendrocygna arborea
- West Indian Woodpecker: Melanerpes superciliaris
- West Indian Wormsnail: Vermetus compactus
- West Irian River Sprat: Clupeoides venulosus
- West Javan Ebony Langur: Trachypithecus auratus mauritius
- West Mexican Chachalaca: Ortalis poliocephala
- West Mexican Knobtail: Epigomphus crepidus
- West Mexican Redhorse: Moxostoma austrinum, Scartomyzon austrinum
- West Pacific Anchovy: Patella dunker, Stolephorus pacificus
- West Peruvian Screech-Owl: Megascops roboratus
- West Siberian Grayling: Thymallus arcticus arcticus
- West Virginia Blind Cave Millipede: Trichopetalum krekeleri
- West Virginia Spring Salamander: Gyrinophilus porphyriticus, Gyrinophilus subterraneus
- West Virginia White: Pieridopsis virgo
- West Wills Valley Cave Beetle: Pseudanophthalmus assimilis
- West Wind Gladiator: Mantophasma zephyra
- West Yunnan Black Crested Gibbon: Nomascus concolor furvogaster
- Westcoast Klipfish: Clinus heterodon
- Westcoast Steenbras: Lithognathus aureti
- Westcoast Toadfish: Perulibatrachus rossignoli
- Westelike Bottelneus: Mormyrus lacerda
- Westerly Toothshell: Pulsellum occidentale
- Western Aquatic Garter Snake: Thamnophis atratus, Thamnophis atratus atratus, Thamnophis atratus hydrophilus, Thamnophis couchii
- Western Archerfish: Toxotes oligolepis
- Western Assamese Macaque: Macaca assamensis pelops
- Western Atlantic Brief Squid: Lolliguncula brevis
- Western Atlantic Finless Eel: Apterichtus kendalli
- Western Atlantic Grenadier: Nezumia atlantica
- Western Atlantic Harbor Seal: Phoca vitulina concolor
- Western Atlantic Seabream: Archosargus rhomboidalis
- Western Atlantic Tusk: Antalis occidentale
- Western Australia River Gizzard Shad: Nematalosa vlaminghi
- Western Australian Black-head Triplefin: Enneapterygius larsonae
- Western Australian Carpet Python: Morelia spilota imbricata, Morelia spilota spilota
- Western Australian Gizzard Shad: Nematalosa vlaminghi
- Western Australian Grunter: Leiopotherapon aheneus
- Western Australian Salmon: Arripis truttacea
- Western Australian Sculpin: Psychrolutes occidentalis
- Western Australian Seahorse: Hippocampus angustus
- Western Azure: Celastrina echo
- Western Balsam Bark Beetle: Dryocoetes confusus
- Western Banded Gecko: Coleonyx variegatus, Coleonyx variegatus abbotti, Coleonyx variegatus bogerti, Coleonyx variegatus utahensis, Coleonyx variegatus variegatus
- Western Banded Tegula: Tegula eiseni
- Western Baneberry: Actaea rubra
- Western Banjo Frog: Limnodynastes dorsalis
- Western Barbastelle: Barbastella barbastellus
- Western Barking Frog: Eleutherodactylus augusti cactorum
- Western Barred Bandicoot: Perameles bougainville, Perameles bougainville bougainville, Perameles bougainville fasciata
- Western Barred Spitting Cobra: Naja nigricollis nigricincta
- Western Beach Tiger Beetle: Cicindela latesignata, Cicindela latesignata latesignata, Cicindela latesignata obliviosa
- Western Bean Cutworm: Loxagrotis albicosta, Richia albicosta
- Western Bearded Pig: Sus barbatus oi
- Western Bent-Winged Bat: Miniopterus magnater
- Western Black Flea Beetle: Phyllotreta pusilla
- Western Black Rhinoceros: Diceros bicornis longipes
- Western Black-Headed Snake: Tantilla planiceps, Thamnophis cyrtopsis
- Western Blacklegged Tick: Ixodes pacificus
- Western Blackneck Garter Snake: Thamnophis cyrtopsis
- Western Blacknose Dace: Rhinichthys obtusus
- Western Blind Snake: Leptotyphlops humilis
- Western Blue Groper: Achoerodus gouldii
- Western Blue Wrasse: Achoerodus gouldii
- Western Bluebird: Sialia mexicana, Sialia mexicana anabelae, Sialia mexicana mexicana
- Western Bog Crangonyctid: Crangonyx richmondensis occidentalis
- Western Bongo: Tragelaphus eurycerus eurycerus
- Western Bonneted Bat: Eumops perotis
- Western Bornean Orang-Utan: Pongo pygmaeus pygmaeus
- Western Bottlenose: Mormyrus lacerda
- Western Bottlenose Mormyrid: Mormyrus lacerda
- Western Box Turtle: Terrapene ornata
- Western Boxelder Bug: Boisea rubrolineata
- Western Branded Skipper: Hesperia colorado
- Western Bristlebird: Dasyornis longirostris
- Western Broad-Nosed Bat: Nycticeius balstoni
- Western Bronze-Naped Pigeon: Columba iriditorques
- Western Brook Char: Salvelinus malma malma
- Western Brook Lamprey: Lampetra ayresii, Lampetra planeri, Lampetra richardsoni, Tonna luteostomum
- Western Brook Trout: Salvelinus malma malma
- Western Brush Lizard: Urosaurus graciosus graciosus
- Western Brush Wallaby: Macropus irma
- Western Burrowing Owl: Athene cunicularia hypugaea
- western Butterfish: Pentapodus vitta
- Western Butterflyfish: Chaetodon assarius
- Western Caecum: Caecum occidentale, Fartulum occidentale
- Western Capercaillie: Tetrao urogallus
- Western Carp Gudgeon: Hypseleotris klunzingeri
- Western Cave Beetle: Pseudanophthalmus occidentalis
- Western Cedar Bark Beetle: Phloeosinus punctatus
- Western Cherry Fruit Fly: Rhagoletis indifferens
- Western Chestnut Mouse: Pseudomys nanus
- Western Chicken Turtle: Deirochelys reticularia miaria
- Western Chinch Bug: Blissus occiduus
- western Chorus Frog: Pseudacris triseriata, Pseudacris triseriata feriarum, Pseudacris triseriata kalmi, Pseudacris triseriata triseriata
- Western Chuckwalla: Sauromalus obesus obesus
- Western Cicada Killer: Sphecius grandis
- Western Cleaner-Clingfish: Cochleoceps bicolor
- Western Cloudywing: Thorybes diversus
- Western Clownfish: Amphiprion ocellaris
- Western Coachwhip: Masticophis flagellum testaceus
- Western Coastal Pyrgomorph: Monistria latevittata
- Western Collared Lizard: Crotaphytus collaris baileyi
- Western Colombian Small-Eared Shrew: Cryptotis squamipes
- Western Comb Grouper: Mycteroperca acutirostris
- Western Conifer-Seed Bug: Leptoglossus occidentalis
- Western Coral Snake: Micruroides euryxanthus, Micruroides euryxanthus euryxanthus
- Western Corbula: Corbula luteola, Juliacorbula luteola
- Western Corella: Cacatua pastinator
- Western Corn Rootworm: Diabrotica virgifera
- Western Cottonmouth: Agkistrodon piscivorus leucostoma
- Western Crat: Craterocephalus eyresii
- Western Crenate Auger: Terebra crenifera
- Western Crested Grouse Locust: Nomotettix cristatus compressus
- Western Crested Loach: Paracobitis malapterura
- Western Crested Morwong: Goniistius gibbosus
- Western Crested Pipefish: Mitotichthys meraculus
- Western Crowned-Pigeon: Goura cristata
- Western Cuban Nesophontes: Nesophontes micrus
- Western Cypress Katydid: Inscudderia taxodii
- Western Damsel Bug: Nabis alternatus, Nabis alternatus uniformis
- Western Diamondback Rattlesnake: Crotalus atrox
- Western Dome: Ventridens brittsi
- Western Dondice: Dondice occidentalis
- Western Dwarf Squirrel: Microsciurus mimulus
- Western Earless Lizard: Holbrookia maculata thermophila
- Western Earth Snake: Virginia valeriae elegans
- Western Ensign Scale: Arctorthezia occidentalis
- Western Erineum Mite: Phyllocoptes didelphis
- Western European Hedgehog: Erinaceus europaeus
- Western False Hemlock Looper: Nepytia freemani
- Western Fanalouc: Eupleres goudotii major
- Western Fanshell: Cyprogenia aberti
- Western Fence Lizard: Sceloporus occidentalis, Sceloporus occidentalis becki, Sceloporus occidentalis biseriatus, Sceloporus occidentalis bocourtii, Sceloporus occidentalis longipes, Sceloporus occidentalis occidentalis, Sceloporus occidentalis taylori
- Western Field Wireworm: Limonius infuscatus
- Western Flag-Face: Propsednura eyrei
- Western Flat-Whorl: Planogyra clappi
- Western Floater: Anodonta kennerlyi
- Western Flower Thrips: Frankliniella occidentalis
- Western Flycatcher: Empidonax difficilis, Empidonax difficilis cineritius, Empidonax difficilis difficilis, Empidonax difficilis hellmayri
- western Footballer: Neatypus obliquus
- Western Forest Hog: Hylochoerus meinertzhageni ivoriensis
- Western Forktail: Ischnura perparva
- Western Fortesque: Centropogon latifrons
- Western Fox Snake: Elaphe vulpina vulpina
- Western Freshwater Hardyhead: Craterocephalus eyresii
- Western Frogfish: Batrachomoeus occidentalis
- Western Furcula: Furcula occidentalis
- Western Galaxias: Galaxias occidentalis
- Western Gentle Lemur: Hapalemur griseus occidentalis
- Western Gerbil: Gerbillus hesperinus
- Western Ghat Glassy Perchlet: Parambassis thomassi
- Western Ghat Loach: Bhavania australis
- Western Ghats Squirrel: Funambulus tristriatus
- Western Giant Eland: Tragelaphus derbianus, Tragelaphus derbianus derbianus
- Western Glacier Stonefly: Zapada glacier
- Western Glass-Snail: Vitrina pellucida
- Western Glossy Snake: Arizona elegans occidentalis
- western Goldeye: Hiodon alosoides, Pipra nettereri
- Western Grapeleaf Skeletonizer: Harrisina brillians
- Western Grasswren: Amytornis textilis
- Western Gray Kangaroo: Macropus fuliginosus
- Western Gray Squirrel: Sciurus griseus
- Western Grebe: Aechmophorus occidentalis
- Western Green Hairstreak: Callophrys affinis
- Western Green Lizard: Lacerta bilineata
- Western Green Toad: Bufo debilis insidior
- Western Green-Tinkerbird: Pogoniulus coryphaeus
- Western Gregory: Kalidos etiambrae, Stegastes obreptus
- Western Grey Kangaroo: Macropus fuliginosus, Macropus fuliginosus fuliginosus
- Western Grey Plantain-Eater: Crinifer piscator
- Western Ground Parrot: Pezoporus wallicus
- Western Grunter: Leiopotherapon aheneus
- Western Gulf Sandhopper: Americorchestia barbarae
- Western Gull: Larus occidentalis, Larus occidentalis livens, Larus occidentalis occidentalis, Larus occidentalis wymani
- Western Hardyhead: Atherinomorus duodecimalis, Leptatherina wallacei
- Western Hartebeest: Alcelaphus buselaphus major
- Western Harvest Mouse: Reithrodontomys megalotis, Reithrodontomys megalotis megalotis
- Western Harvester Ant: Pogonomyrmex occidentalis
- Western Heather Vole: Phenacomys intermedius
- Western Hemlock Looper: Lambdina fiscellaria, Lambdina fiscellaria lugubrosa
- Western Hemlock Wood Stainer: Gnathotrichus sulcatus
- Western Hermann’s Tortoise: Testudo hermanni hermanni
- Western Himalayan Goral: Naemorhedus goral bedfordi
- Western Hog-Nosed Skunk: Conepatus mesoleucus, Conepatus mesoleucus telmalestes
- Western Hog-Nosed Snake: Heterodon nasicus, Heterodon nasicus gloydi, Heterodon nasicus kennerlyi, Heterodon nasicus nasicus
- Western Hognose Snake: Heterodon nasicus
- Western Hook-Nosed Snake: Gyalopion canum
- Western Hooknose Snake: Gyalopion canum
- Western Hoolock: Bunopithecus hoolock hoolock
- Western Horsefly: Tabanus punctifer
- Western House Wren: Troglodytes aedon parkmanii
- Western Indigo Snake: Drymarchon corais
- Western Javan Gibbon: Hylobates moloch moloch
- Western Jewfish: Glaucosoma hebraicum
- Western Jumping Blenny: Lepidoblennius marmoratus
- Western Jumping Mouse: Zapus princeps, Zapus princeps oregonus, Zapus princeps princeps
- Western Kelpfish: Chironemus georgianus
- Western Kermes: Allokermes rattani
- Western Kiang: Equus kiang kiang
- Western King Prawn: Melicertus latisulcatus
- Western King Wrasse: Coris auricularis
- Western Kingbird: Tyrannus verticalis
- Western Klipspringer: Oreotragus oreotragus porteousi
- Western Kneria: Kneria polli
- Western Lahontan Pyrg: Pyrgulopsis longiglans
- Western Lamprey: Lampetra ayresii
- Western Leaf Lizard: Stenocercus fimbriatus
- Western Leaf-Footed Bug: Leptoglossus clypealis
- Western Leaf-Nosed Snake: Phyllorhynchus decurtatus
- Western Least Bittern: Ixobrychus exilis hesperis
- Western Lesser Siren: Siren intermedia nettingi
- Western Lilliput: Toxolasma mearnsi
- Western Long-Billed Corella: Cacatua pastinator
- Western Long-Nosed Snake: Rhinocheilus lecontei lecontei
- Western Long-Tailed Brush Lizard: Urosaurus graciosus graciosus
- Western Long-Tailed Hermit: Phaethornis longirostris
- Western Long-Tailed Lizard: Urosaurus graciosus graciosus
- Western Long-Toed Salamander: Ambystoma macrodactylum, Ambystoma macrodactylum macrodactylum
- Western Long-Tongued Bat: Glossophaga morenoi
- Western Longwing: Capnobotes occidentalis
- Western Lowland Gorilla: Gorilla gorilla gorilla
- Western Lyre Snake: Trimorphodon biscutatus, Trimorphodon biscutatus biscutatus, Trimorphodon biscutatus lambda, Trimorphodon biscutatus vilkinsonii
- Western Marbled Whiptail: Cnemidophorus marmoratus, Cnemidophorus marmoratus marmoratus
- Western Marsh Frog: Heleioporus barycragus
- Western Marsh-Harrier: Circus aeruginosus
- Western Massasauga: Sistrurus catenatus tergeminus
- Western Mastiff-Bat: Eumops perotis
- Western Meadowhawk: Sympetrum occidentale subsp. californicum
- Western Meadowlark: Sturnella neglecta, Sturnella neglecta neglecta
- Western Minnow: Galaxias occidentalis
- Western Mole Cricket: Gryllotalpa cultriger
- Western Mosquitofish: Gambusia affinis, Gambusia affinis holbrookii, Gambusia speciosa
- Western Mountain Reedbuck: Redunca fulvorufula adamauae
- Western Mouse: Pseudomys occidentalis
- Western Mud Minnow: Galaxiella munda
- Western Mud Nassa: Nassarius tiarula
- Western Mud Snake: Farancia abacura reinwardtii
- Western Mudfish: Amia calva
- Western Naked-Backed Fruit Bat: Dobsonia peroni
- western Narrow-Mouthed Toad: Gastrophryne olivacea
- Western Nectar Bat: Lonchophylla hesperia
- Western Needle-Clawed Bushbaby: Euoticus elegantulus
- Western Needle-Clawed Galago: Euoticus elegantulus
- Western Nimba Toad: Nimbaphrynoides occidentalis
- Western Oak Looper: Lambdina fiscellaria, Lambdina fiscellaria somniaria
- Western Orange Perch: Lepidoperca filamenta
- Western Orthezia: Arctorthezia occidentalis
- Western Pacific Gizzard Shad: Nematalosa come
- Western Painted Turtle: Chrysemys picta, Chrysemys picta bellii
- Western Palm Squirrel: Epixerus ebii
- Western Paper Wasp: Mischocyttarus flavitarsis
- western Paragalaxias: Paragalaxias julianus
- Western Partridge Pigeon: Geophaps smithii
- Western Patagonian Laucha: Eligmodontia morgani
- Western Patch-Nosed Snake: Salvadora hexalepis, Salvadora hexalepis hexalepis, Salvadora hexalepis mojavensis, Salvadora hexalepis virgultea
- Western Patchnose Snake: Salvadora hexalepis
- Western Pea Crab: Pinnixa occidentalis
- Western Pearlshell: Margaritifera falcata
- Western Pebble-Mound Mouse: Pseudomys chapmani
- Western Pigmy Rattlesnake: Sistrurus miliarius streckeri
- Western Pimpleback: Quadrula pustulosa mortoni
- Western Pine Beetle: Dendroctonus brevicomis
- Western Pine Elfin: Callophrys eryphon, Callophrys eryphon eryphon, Callophrys eryphon purpurascens
- Western Pine Shoot Borer: Eucosma sonomana
- Western Pine Tip Moth: Rhyacionia bushnelli
- Western Pinewood Stainer: Gnathotrichus retusus
- Western Pipistrelle: Pipistrellus hesperus
- Western Plains Garter Snake: Thamnophis radix haydenii
- Western Plant Bug: Lygus hesperus, Rhinacloa forticornis
- Western Pocket Gopher: Thomomys mazama, Thomomys mazama couchi, Thomomys mazama glacialis, Thomomys mazama louiei, Thomomys mazama melanops, Thomomys mazama tumuli
- Western Pond Turtle: Emys marmorata
- Western Pondhawk: Erythemis collocata
- Western Prairie Grasshopper: Conocephalus saltans
- Western Pygmy Perch: Edelia vittata
- Western Pygmy Possum: Cercartetus concinnus
- Western Pygmy-Blue: Brephidium exile, Brephidium exilis
- Western Quoll: Dasyurus geoffroii
- Western Rainbowfish: Apistops carinatus, Melanotaenia australis, Melanotaenia splendida australis
- Western Rattlesnake: Crotalus viridis, Crotalus viridis abyssus, Crotalus viridis cerberus, Crotalus viridis concolor, Crotalus viridis helleri, Crotalus viridis lutosus, Crotalus viridis nuntius, Crotalus viridis oreganus, Crotalus viridis viridis
- Western Red Bat: Lasiurus blossevillii
- Western Red Colobus: Procolobus badius, Procolobus badius gordonorum, Procolobus badius kirkii, Procolobus badius rufomitratus
- Western Red Damsel: Amphiagrion abbreviatum
- Western Red Mullet: Upeneichthys vlamingii
- Western Red-Backed Salamander: Plethodon vehiculum
- Western Red-Backed Vole: Clethrionomys californicus
- Western Red-Bellied Tiger Beetle: Cicindela sedecimpunctata
- Western Red-Shouldered Plant Bug: Thyanta pallidovirens
- Western Red-Tailed Hawk: Buteo jamaicensis calurus
- Western Red-Tailed Skink: Eumeces gilberti rubricaudatus
- Western Redback Salamander: Plethodon vehiculum
- Western
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