1. Ocelot
2. Octopus
3. Okapi
4. Old World Monkey
5. Olive Baboon
6. Olive Ridley Sea Turtle
7. Olive Sparrow
8. Olive Warbler
9. Onager
10. Orange-breasted Green Pigeon
11. Orangutan
12. Oribi
13. Owl
14. Oropendola
15. Orthopteran
16. Oscellated Skink
17. Oscellated Turkey
18. Oyster
19. Oyster Catcher
20. Ocean Sunfish
21. Oceanic White-tip Shark
22. Onion Fly
23. Orangeback Fairy Wrasse
24. Oregon Spotted Frog
25. Olive-winged Bulbul
26. Okinawa Bulbul
27. Olrog’s Gull
28. Omei Horned Toad
29. Omnivorous Bat
30. Oniscidean
31. Oranda Goldfish
32. Orb Weaver Spider
33. Oriental Birdwing
34. Orchard Oriole
35. Orchid Bee
36. Orchid Mantis
37. Osmia Bee
38. Osprey
39. Ostrich
40. Otterhound
41. Owl Butterfly
42. Owlfly
43. Ox
44. Ox Beetle
45. Oxpecker
46. Oyster Drill
47. Ozark Snail
48. Ozark Yellowjacket Wasp
