- Ocelot
- Octopus
- Okapi
- Opossum
- Orangutan
- Orca
- Ostrich
- Otter
- Owl
- Osprey
- Oryx
- Ox
- Oyster
- Oarfish
- Ocean Sunfish
- Olive Ridley Sea Turtle
- Onager
- Olingo
- Owl Monkey
- Orange Clownfish
- Oriental Stork
- Owl Butterfly
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