(1) O Chan - Oblong Mojarra

(2) Oblong Otter Clam - Ocellated Dwarf Gecko

(3) Ocellated Earth Snake - Ogies-Kardinaal

(4) Ogies-Skerpioenvis - Okokoniko

(5) Okokoniko - Olive Flathead-Gudgeon

(6) Olive Flathead-Gudgeon - Ombrina

(7) Ombrina - Oorida Ctenotus

(8) Oorlaide Dikkop - Orange-Bellied Euphonia

(9) Orange-Bellied Euphonia - Orangestripe Triggerfish

(10) Orangestripe Triggerfish - Oriental Linsangs

(11) Oriental Linsangs - Oropéndola Gorjinegra

(12) Oropéndola Mayor - Ostra Gigante

(13) Ostra Portuguesa - Ouachita Madtom

(14) Ouachita Mantleslug - Oxyrhynque HuppÃ©

(15) Oxyrhynque HuppÃ© - Oštrulja