141 Animals that Start with O | List of Animals Beginning with O

Last Updated on October 31, 2023

As we explore the world of animals that start with “O”, we discover a diverse range of creatures that inhabit our planet. From the nocturnal owl to the agile orangutan, these animals have evolved to adapt to different environments and lifestyles. In this article, we will take a closer look at some of the most intriguing animals that start with “O”, and delve into their biology, behavior, and conservation status.

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Animals that Start with O

Animals that Start with OPin

List of Common Animals Starting with O

  • Oarfish
  • Ocellaris Clownfish
  • Ocelot
  • Octopus
  • Oilbird
  • Okapi
  • Old English Sheepdog
  • Olive Ridley Sea Turtle
  • Olm
  • Opossum
  • Orangutan
  • Orb Weaver
  • Orca
  • Oriole
  • Ornate Chorus Frog
  • Ornate Hawk-Eagle
  • Oryx
  • Osprey
  • Ostrich
  • Otter
  • Owl
  • Owl Butterfly
  • Ox
  • Oyster
  • Oystercatcher

Common Animals that Start with O | Interesting Facts & Pictures


The world’s longest bony fish that eats tiny plankton.


Ocellaris Clownfish

Clownfish are born male, but they have the ability to turn into a female. This fish is found in reefs and lagoons near Australia and Southeast Asia.

Ocellaris ClownfishPin


A wild cat that is found in the forests of South America and southern North America. This creature hunts small mammals, birds, and reptiles.



They have three hearts and blue blood. Since they have no bones, they can squeeze into tight spaces.



This bird uses echolocation to find its way within the caves where it roosts and nests from Trinidad/Guyana to Bolivia.



These creatures belong to the giraffe family. Their tongue is long enough to clean its eyes and ears.


Old English Sheepdog

When this dog breed first came to the United States, it was a common pet for a wealthy person.

Old English SheepdogPin

Olive Ridley Sea Turtle

Able to sleep underwater for two hours before coming up for air.

Olive Ridley Sea TurtlePin


This aquatic salamander has translucent skin.



Due to their low body temperature and immune systems, it’s rare for one to carry rabies.



The two species of orangutans are critically endangered due to deforestation. These apes eat fruit, live in trees, and are native to Indonesia and Malaysia.


Orb Weaver

There are over 3,000 species of these spiders, being the third-largest spider family.

Orb WeaverPin


They are also known as the killer whale, and they’re the largest member of the oceanic dolphin family. They are apex predators, which means they’re at the top of the food chain.



Unlike many other insect-eating birds, orioles eat spiny or hairy caterpillars.


Ornate Chorus Frog

This small frog is found in the southeast United States and in pine woodlands.

Ornate Chorus FrogPin

Ornate Hawk-Eagle

This brown and white eagle has a large crest which is raised when the bird gets excited.

Ornate Hawk-EaglePin


A very large antelope that can weigh anywhere from 220 to 450 pounds.



This bird is found in the Americas, Europe, Africa, Asia, and Australia.



The world’s biggest bird and the fastest bird on land. They can run at 43 mph.



Sea otters have the thickest fur of any animal.



They can rotate their necks 270 degrees.


Owl Butterfly

These butterflies get their name from the owl-like eye markings on the undersides of their wings. They’re found in Central and South American rainforests.

Owl ButterflyPin


People have depended on these strong animals to do work for about 6,000 years.



Their shells are made of two parts with a hinge along one end. Different oysters produce different things, such as being edible food or producing pearls.



A large wading bird found on the coasts of Europe, Asia, and North Africa. These birds don’t typically eat oysters, instead, they eat cockles, mussels, and worms.


Animals Beginning with O (by Locations)

Wild Animals that Start with O

  1. Ocelot
  2. Okapi
  3. Orangutan
  4. Oryx
  5. Otter
  6. Ounce
  7. Osprey
  8. Ostrich
  9. Owl
  10. Orca
  11. Octopus
  12. Opossum

RelatedWild Animals in English

Domestic Animals Beginning with O

  1. Ox
  2. Ostrich
  3. Otter
  4. Old English Sheepdog
  5. Oriental Shorthair

RelatedFarm and Domestic Animals in English

Sea and Ocean Animals that Start with O

  1. Octopus
  2. Orca (Killer Whale)
  3. Oyster
  4. Ocean Sunfish
  5. Oceanic Whitetip Shark
  6. Opah (Moonfish)
  7. Osprey
  8. Olive Ridley Sea Turtle
  9. Orange Roughy
  10. Oceanic Dolphin
  11. Ocean Perch
  12. Ocean Triggerfish
  13. Ocean Quahog
  14. Ocean Rainbowfish
  15. Oceanic Pufferfish
  16. Oceanic Sea Spider
  17. Oceanic Saury
  18. Oceanic Barracuda
  19. Oceanic Lanternfish
  20. Oceanic Silverside
  21. Oceanic Squid
  22. Oceanic Needlefish
  23. Oceanic Hornetfish
  24. Oceanic Bonito
  25. Oceanic Skipjack
  26. Oceanic Surgeonfish
  27. Oceanic Kelpfish
  28. Oceanic Trumpeter
  29. Oceanic Whiptail
  30. Oceanic Dottyback

RelatedSea and Ocean Animals in English

Zoo Animals that Start with O

  1. Ocelot
  2. Octopus
  3. Okapi
  4. Olive baboon
  5. Opossum
  6. Orangutan
  7. Oryx
  8. Ostrich
  9. Otter
  10. Owl
  11. Ox
  12. Ozark hellbender (a type of salamander)
  13. Osprey (a type of bird)
  14. Ocean sunfish (also known as Mola Mola)
  15. Orange-winged amazon (a type of parrot)
  16. Orange-headed thrush (a type of bird)
  17. Orange-bellied parrot
  18. Oriental small-clawed otter
  19. Oriental pied hornbill (a type of bird)
  20. Olive ridley sea turtle.

RelatedZoo Animals in English

Animals with O (by Types)

Mammals that Start with O

  1. Ocelot
  2. Olingo
  3. Okapi
  4. Olive baboon
  5. Onager
  6. Orangutan
  7. Oribi
  8. Otter
  9. Ox
  10. Ozark big-eared bat

RelatedMammals in English

Insects that Start with O

  1. Oak gall wasp
  2. Oak leafroller
  3. Oak leaf skeletonizer
  4. Oak processionary moth
  5. Oat bug
  6. Oatmeal moth
  7. Ocellate gallinipper
  8. Ochre mark leafhopper
  9. Ochreous stink bug
  10. Octolasion earthworm
  11. Odd-legged weevil
  12. Oil beetle
  13. Oil palm bunch moth
  14. Old-house borer
  15. Oleander aphid
  16. Oleander caterpillar
  17. Olive fruit fly
  18. Olive lace bug
  19. Olive treehopper
  20. Onion maggot
  21. Onion thrips
  22. Orange assassin bug
  23. Orange barred sulphur
  24. Orange bug
  25. Orange dog
  26. Orange mint moth
  27. Orange oakleaf
  28. Orange-spotted tiger clearwing moth
  29. Orchard ermine moth
  30. Orchard orb-weaver
  31. Oriental beetle
  32. Oriental cockroach
  33. Ornate moth
  34. Osage orange gall
  35. Osmia bee
  36. Osteopilus treefrog
  37. Ostomyia moth
  38. Otala snail
  39. Owl fly
  40. Ox beetle

RelatedInsects in English

Birds that Start with O

  1. Ocellated turkey
  2. Ochre-breasted antpitta
  3. Olive-backed sunbird
  4. Olive-sided flycatcher
  5. Orange-bellied flowerpecker
  6. Orange-billed nightingale-thrush
  7. Orange-breasted bunting
  8. Orange-breasted green pigeon
  9. Orange-cheeked waxbill
  10. Orange-crowned warbler
  11. Orange-fronted parakeet
  12. Orange-headed thrush
  13. Orange-winged amazon
  14. Oriental bay owl
  15. Oriental darter
  16. Oriental honey-buzzard
  17. Oriental magpie-robin
  18. Oriental pied hornbill
  19. Osprey
  20. Ostrich
  21. Ovenbird
  22. Owl finch
  23. Owlet-nightjar
  24. Oxford ragwort bee-fly

Related: List of Birds in English

Animals Starting with the Letter “O” for Kindergarten

  1. Octopus
  2. Otter
  3. Ostrich
  4. Orangutan
  5. Owl
  6. Ocelot
  7. Osprey
  8. Orca
  9. Oyster
  10. Okapi

Frequently Asked Questions on O Animals

What are some animals that start with O?

Some animals that start with the letter O are otter, orca, octopus, oppossum, ox, ostrich, orangutan, ocelot, oyster, okapi, oarfish, ox and owls.

What are African animals that begin with O?

There are several African animals that start with the letter “O”. Some of them are the oribi, orangutan, okapi, ostriches, olm monkey, orca whale, orange-spotted Filefish and olive Baboon.

Is there any reptile that starts with O?

There is one reptile that starts with O, the Ogrefish monitor (Varanus ocellatus). This large species of monitor lizard can be found in Western Australia. It can grow up to 7.5 feet long and weigh up to 30 pounds. The Ogrefish Monitor is carnivorous, preying on small animals such as rats, lizards, frogs, and birds.

All Animals A-Z List

Alphabetical List of Animals from A to Z.

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