Animals That Start With O

Animals That Start With O | List, Fun Facts, And A Free Worksheet

Animals that start with O! How many can you name? Below you’ll find a comprehensive list of animals beginning with the letter O, together with fun facts and a free worksheet to help you learn or teach these animal names.

List Of Animals Starting With O

  1. Ocelot
  2. Octopus
  3. Okapi
  4. Olive Baboon
  5. Olingo
  6. Opossum
  7. Orangutan
  8. Orca
  9. Oriole
  10. Orinoco Crocodile
  11. Ornate Box Turtle
  12. Ostrich
  13. Otter
  14. Owl
  15. Ox
  16. Oxpecker
  17. Old English Sheepdog
  18. Old World Flycatcher
  19. Olive Ridley Turtle
  20. Olive Sea Snake
  21. Onager (a type of wild ass)
  22. Osprey
  23. Otterhound (a dog breed)
  24. Oriental Shorthair (a cat breed)
  25. Ouakari (a type of monkey)
  26. Oystercatcher (a bird)
  27. Orange Roughy (a deep-sea fish)
  28. Ornate Ghost Pipefish
  29. Ornate Wobbegong (a type of shark)
  30. Orb Weaver (a type of spider)
  31. Oriental Fire-bellied Toad
  32. Otter Shrew
  33. Oribi (a type of antelope)
  34. Oriental Turtle Dove
  35. Ocellated Turkey
  36. Ochre Sea Star
  37. Oldfield Mouse
  38. Orange-winged Amazon (a type of parrot)
  39. Olive Flounder
  40. Oval Squid
  41. Orange-tip Butterfly
  42. Overo Horse
  43. Oriental Cockroach
  44. Orlov Trotter (a horse breed)
  45. Oriental Rat Flea
  46. Obscure Berrypecker (a bird)
  47. Orange Weaver (a type of bird)
  48. Ogilby’s Duiker (a type of antelope)
  49. Otago Skink
  50. Orphean Warbler (a type of bird)

Animals That Start With O – Fun Facts


Ocelots are nocturnal animals and have superb night vision which is six times better than that of humans.


Some species of octopuses can change their skin color and texture to blend seamlessly into their environment, making them the ultimate masters of camouflage.


Despite its striped hindquarters that resemble a zebra, the Okapi is actually a relative of the giraffe.

Olive Baboon

Olive baboons use over 30 different vocalizations to communicate with each other.


The Olingo is often mistaken for its relative, the kinkajou, because they both have similar body structure and are from the same family, Procyonidae.


Opossums have a prehensile tail, which they can use to grab branches, carry small objects or even hang upside down.


Orangutans are among the most intelligent primates. They use a variety of sophisticated tools and construct elaborate sleeping nests each night from branches and foliage.


Also known as Killer Whales, Orcas are not whales at all. They are actually the largest species of the dolphin family.


The Baltimore Oriole is the state bird of Maryland and was named for the 17th-century Lord Baltimore, because its colors matched the coat-of-arms of the lord’s family.

Orinoco Crocodile

The Orinoco Crocodile is critically endangered and is one of the most threatened crocodile species in the world.

Ornate Box Turtle

These turtles are known for their domed shell which is hinged at the bottom, allowing the animal to retreat inside and close the shell tightly to protect itself from predators.


The Ostrich is the largest bird in the world and, although flightless, can outrun many land predators with its speed of up to 60 mph.


Some otters use rocks as tools to crack open their food – they’re one of the few mammal species known to do this.


Owls have specialized feathers with fringes of varying softness that help muffle sound when they fly. Their silent flight gives them an advantage when they’re hunting.


Oxen are bovines trained as draft animals. Often they are adult, castrated males of the species Bos taurus.


Oxpeckers and large mammals like rhinos or zebras have a symbiotic relationship where the birds eat the parasites off the mammal’s skin.

Old English Sheepdog

Despite their name, Old English Sheepdogs are not that old. They’ve been around since the early 19th century and were actually developed in the west of England.

Old World Flycatcher

Old World Flycatchers are named after their feeding habits – they catch insects in flight.

Olive Ridley Turtle

Olive Ridley Turtles are known for their mass nesting called “arribadas”. During these events, thousands of females come together on the same beach to lay eggs.

Olive Sea Snake

Olive sea snakes are one of the few species of sea snakes that have been observed mating underwater.


Onagers, a type of wild ass, are one of the fastest mammals, capable of reaching speeds up to 70 km/h (43 mph) in short sprints.


The Osprey is unique among raptors for its habit of routinely diving underwater for its prey. It’s the only bird of prey to have a reversible outer toe to help it grip fish.


The Otterhound, a dog breed from England, is one of the most endangered dog breeds, with fewer than 800 of them thought to exist worldwide.

Oriental Shorthair

Oriental Shorthairs have a long, thin tail that tapers to a point, which complements their sleek, elegant appearance.


Ouakari monkeys, native to the Amazon, are known for their distinctive bald heads and bright red faces.


Despite their name, oysters do not make up a significant part of the oystercatcher’s diet. They actually eat a wide variety of shellfish.

Orange Roughy

The Orange Roughy is a deep-sea fish known for its extraordinary lifespan. Some individuals have been estimated to live for up to 150 years.

Ornate Ghost Pipefish

Ornate Ghost Pipefish are masters of disguise. They change their color to match their surroundings and float with their heads down to blend in with the seagrass and coral.

Ornate Wobbegong

The Ornate Wobbegong is a type of carpet shark known for its intricate, maze-like markings, which help it blend into the ocean floor.

Orb Weaver

Orb Weaver spiders are named for their beautiful, round, wheel-like webs. They build and abandon a new web each day.

Oriental Fire-bellied Toad

When threatened, Oriental Fire-bellied Toads will arch their bodies to show off their bright red or orange underside as a warning to predators.

Otter Shrew

Despite their name, Otter Shrews are not true shrews. They are semi-aquatic mammals native to Africa and have dense, waterproof fur and webbed hind feet.


Oribi are small antelope that inhabit the grasslands of Africa. They can leap high in the air as a sign to predators that they have been spotted, a behavior known as “stotting”.

Oriental Turtle Dove

Oriental Turtle Doves are also known as Rufous Turtle Doves. They are native to Europe and Asia, and their song is a cooing sound, similar to other doves.

Ocellated Turkey

The Ocellated Turkey, native to the Yucatán Peninsula, is named for the eye-like spots (or ocelli) on its tail feathers.

Ochre Sea Star

The Ochre Sea Star can regenerate lost arms, making it a master of survival in the harsh intertidal zone.

Oldfield Mouse

Oldfield mice, found in the southeastern United States, are often monogamous – a rare trait in mammals.

Orange-winged Amazon

The Orange-winged Amazon is a bright, colorful parrot native to South America. Its name comes from the distinctive orange feathers in its wings, which are usually only visible in flight.

Olive Flounder

The Olive Flounder, also known as the Japanese Flounder, is a flatfish that lies on its side on the ocean floor.

Oval Squid

Oval Squid are able to rapidly change their skin color. They use this ability for communication and camouflage.

Orange-tip Butterfly

Only the males of the Orange-tip Butterfly species have the orange tips on their wings. The females’ wings are mostly white.

Overo Horse

Overo is a pattern of white spotting in horses. Overo horses are not a breed, but can be found in many breeds.

Oriental Cockroach

The Oriental Cockroach is sometimes called a “waterbug” because it prefers dark, moist places.

Orlov Trotter

The Orlov Trotter, a horse breed from Russia, was specifically bred for speed and stamina to cover long distances in trotting races.

Oriental Rat Flea

The Oriental Rat Flea is historically significant because it was a principal vector for the Bubonic Plague, also known as the Black Death, in the Middle Ages.

Obscure Berrypecker

The Obscure Berrypecker, a bird from New Guinea, is aptly named. It’s rarely seen and little is known about its behavior and habits.

Orange Weaver

The male Orange Weaver bird builds an elaborate nest to attract a mate, using grasses and thin strips of leaves.

Ogilby’s Duiker

Ogilby’s Duiker is a small species of antelope found in the forests of West Africa. They are solitary animals, with males and females usually only coming together to mate.

Otago Skink

The Otago Skink, one of the largest lizards in New Zealand, gives birth to live young rather than laying eggs, which is unusual for a lizard.

Orphean Warbler

The Orphean Warbler, a songbird from Europe, is named after Orpheus, a character from Greek mythology who was a gifted musician.

Worksheet – Animals That Start With O

Animals That Start With O - Worksheet

This free worksheet has a list of 12 common animals that start with the letter O, together with pictures. To complete the worksheet, you must match the animal name to the corresponding picture.

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