Ocelot: The ocelot, also known as the dwarf leopard, is a wild cat distributed extensively within South America.
The orca or killer whale is a toothed whale belonging to the oceanic dolphin family, of which it is the largest member.
Octopus: An octopus is a soft-bodied, eight-limbed mollusc of the order Octopoda.
Okapi: The okapi is a giraffid artiodactyl mammal native to the northeast of the Democratic Republic of the Congo in Central Africa.
Old English Sheepdog: The Old English Sheepdog is a large breed of dog which was developed in England from early herding types of dog.
Opossum: Opossums are members of the marsupial order Didelphimorphia native to the Americas.
Orangutan: Orangutans are great apes native to the rainforests of Indonesia and Malaysia.
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Ostrich: The ostrich or common ostrich is either of two species of large flightless birds native to Africa, the only living member of the genus Struthio.
Owl: Owls are birds from the order Strigiformes, which includes over 200 species of mostly solitary and nocturnal birds of prey typified by an upright stance.
Otter: Otters are carnivorous mammals in the subfamily Lutrinae.