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This reference is perfect for English learners who want to know more about animals starting with the letter “O.” You’ll learn about various types of animals, including wild, domestic, sea creatures, and even zoo animals. Whether you’re a beginner or looking to enhance your vocabulary, this journey through the animal kingdom will help you discover and remember new words.
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Animals that Start with O
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
Oarfish
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.
Ocelot
A wild cat that is found in the forests of South America and southern North America. This creature hunts small mammals, birds, and reptiles.
Octopus
They have three hearts and blue blood. Since they have no bones, they can squeeze into tight spaces.
Oilbird
This bird uses echolocation to find its way within the caves where it roosts and nests from Trinidad/Guyana to Bolivia.
Okapi
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.
Olive Ridley Sea Turtle
Able to sleep underwater for two hours before coming up for air.
Olm
This aquatic salamander has translucent skin.
Opossum
Due to their low body temperature and immune systems, it’s rare for one to carry rabies.
Orangutan
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.
Orca
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.
Oriole
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 Hawk-Eagle
This brown and white eagle has a large crest which is raised when the bird gets excited.
Oryx
A very large antelope that can weigh anywhere from 220 to 450 pounds.
Osprey
This bird is found in the Americas, Europe, Africa, Asia, and Australia.
Ostrich
The world’s biggest bird and the fastest bird on land. They can run at 43 mph.
Otter
Sea otters have the thickest fur of any animal.
Owl
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.
Ox
People have depended on these strong animals to do work for about 6,000 years.
Oyster
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.
Oystercatcher
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
- Ocelot
- Okapi
- Orangutan
- Oryx
- Otter
- Ounce
- Osprey
- Ostrich
- Owl
- Orca
- Octopus
- Opossum
Related: Wild Animals in English
Domestic Animals Beginning with O
- Ox
- Ostrich
- Otter
- Old English Sheepdog
- Oriental Shorthair
Related: Farm and Domestic Animals in English
Sea and Ocean Animals that Start with O
- Octopus
- Orca (Killer Whale)
- Oyster
- Ocean Sunfish
- Oceanic Whitetip Shark
- Opah (Moonfish)
- Osprey
- Olive Ridley Sea Turtle
- Orange Roughy
- Oceanic Dolphin
- Ocean Perch
- Ocean Triggerfish
- Ocean Quahog
- Ocean Rainbowfish
- Oceanic Pufferfish
- Oceanic Sea Spider
- Oceanic Saury
- Oceanic Barracuda
- Oceanic Lanternfish
- Oceanic Silverside
- Oceanic Squid
- Oceanic Needlefish
- Oceanic Hornetfish
- Oceanic Bonito
- Oceanic Skipjack
- Oceanic Surgeonfish
- Oceanic Kelpfish
- Oceanic Trumpeter
- Oceanic Whiptail
- Oceanic Dottyback
Related: Sea and Ocean Animals in English
Zoo Animals that Start with O
- Ocelot
- Octopus
- Okapi
- Olive baboon
- Opossum
- Orangutan
- Oryx
- Ostrich
- Otter
- Owl
- Ox
- Ozark hellbender (a type of salamander)
- Osprey (a type of bird)
- Ocean sunfish (also known as Mola Mola)
- Orange-winged amazon (a type of parrot)
- Orange-headed thrush (a type of bird)
- Orange-bellied parrot
- Oriental small-clawed otter
- Oriental pied hornbill (a type of bird)
- Olive ridley sea turtle.
Related: Zoo Animals in English
Animals with O (by Types)
Mammals that Start with O
- Ocelot
- Olingo
- Okapi
- Olive baboon
- Onager
- Orangutan
- Oribi
- Otter
- Ox
- Ozark big-eared bat
Related: Mammals in English
Insects that Start with O
- Oak gall wasp
- Oak leafroller
- Oak leaf skeletonizer
- Oak processionary moth
- Oat bug
- Oatmeal moth
- Ocellate gallinipper
- Ochre mark leafhopper
- Ochreous stink bug
- Octolasion earthworm
- Odd-legged weevil
- Oil beetle
- Oil palm bunch moth
- Old-house borer
- Oleander aphid
- Oleander caterpillar
- Olive fruit fly
- Olive lace bug
- Olive treehopper
- Onion maggot
- Onion thrips
- Orange assassin bug
- Orange barred sulphur
- Orange bug
- Orange dog
- Orange mint moth
- Orange oakleaf
- Orange-spotted tiger clearwing moth
- Orchard ermine moth
- Orchard orb-weaver
- Oriental beetle
- Oriental cockroach
- Ornate moth
- Osage orange gall
- Osmia bee
- Osteopilus treefrog
- Ostomyia moth
- Otala snail
- Owl fly
- Ox beetle
Related: Insects in English
Birds that Start with O
- Ocellated turkey
- Ochre-breasted antpitta
- Olive-backed sunbird
- Olive-sided flycatcher
- Orange-bellied flowerpecker
- Orange-billed nightingale-thrush
- Orange-breasted bunting
- Orange-breasted green pigeon
- Orange-cheeked waxbill
- Orange-crowned warbler
- Orange-fronted parakeet
- Orange-headed thrush
- Orange-winged amazon
- Oriental bay owl
- Oriental darter
- Oriental honey-buzzard
- Oriental magpie-robin
- Oriental pied hornbill
- Osprey
- Ostrich
- Ovenbird
- Owl finch
- Owlet-nightjar
- Oxford ragwort bee-fly
Related: List of Birds in English
Animals Starting with the Letter “O” for Kindergarten
- Octopus
- Otter
- Ostrich
- Orangutan
- Owl
- Ocelot
- Osprey
- Orca
- Oyster
- Okapi
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