Animals Names That Start with O [Fun Facts & Complete List]

Did you know that octopuses have three hearts and blue blood? But they’re not the only fascinating animals whose names start with the letter O! In this article, we’ll explore mammals, birds, reptiles, amphibians, fish, insects, and even extinct animals that all start with O.

Popular Animals that Start with O

Here are some of the most well-known animals starting with O:

• Ocelot – A wild cat with a striking spotted coat.
• Octopus – A highly intelligent sea creature with eight arms.
• Orangutan – A large, intelligent great ape known for its red fur.
• Ostrich – The largest bird in the world, known for its speed.
• Otter – A playful and agile aquatic mammal.

Pet Animals That Start with O

• Old English Sheepdog – A fluffy, intelligent herding dog breed.
• Oranda Goldfish – A fancy goldfish with a distinctive head growth.
• Ori-Pei – A designer dog breed that’s a mix of a Pug and a Shar-Pei.

Farm Animals That Start with O

• Onagadori Chicken – A rare Japanese chicken breed with exceptionally long tail feathers.
• Ox – A strong, domesticated bovine used for farming and labor.

Wild Animals That Start with O

• Okapi – A rare mammal related to the giraffe, found in Africa.
• Olive Baboon – A social primate found across Africa.
• Oribi – A small, graceful antelope found in grasslands.
• Olingo – A nocturnal mammal related to raccoons.

Diverse Animal Types Starting with O

Mammals That Start with O

• Onager – A wild ass native to Asia.
• Olympic Marmot – A rodent found in the Olympic Mountains of Washington state.
• Opossum – A marsupial known for playing dead when threatened.

Birds That Start with O

• Ocellated Turkey – A beautifully colored wild turkey found in Central America.
• Orange-Crowned Warbler – A small migratory songbird.
• Orchard Oriole – A strikingly colored oriole bird.
• Osprey – A bird of prey that specializes in hunting fish.

Reptiles and Amphibians That Start with O

• Olive Python – A large, non-venomous snake from Australia.
• Olive Sea Snake – A venomous sea snake found in the Indo-Pacific.
• Oenpelli Python – A rare snake native to Australia.
• Oregon Spotted Frog – An endangered amphibian found in North America.

Fish That Start with O

• Oarfish – A long, deep-sea fish often linked to sea serpent legends.
• Ocean Whitefish – A species of fish found in the Pacific Ocean.
• Opah – A large, colorful fish also known as the moonfish.
• Orange Roughy – A deep-sea fish known for its long lifespan.

Insects and Other Small Creatures That Start with O

• Old House Borer – A beetle that damages wooden structures.
• Oleander Hawk Moth – A large, striking moth with green markings.
• Orb Weaver – A spider known for its intricate, circular webs.
• Owlfly – An insect that resembles both an owl and a dragonfly.

Extinct Animals That Start with O

• Opabinia – A bizarre prehistoric marine creature with five eyes.
• Ornithocheirus – A flying reptile from the dinosaur era.
• Ornithomimus – A fast-running dinosaur that resembled modern ostriches.
• Oviraptor – A feathered dinosaur believed to have been a nest protector.

Full List of Animals That Start with O

Here’s a complete list of animals starting with O:

Animal Name	Animal Name	Animal Name
Oak Toad	Oarfish	Ocean Perch
Ocean Pout	Ocean Whitefish	Oceanic Whitetip Shark
Ocellated Turkey	Ocelot	Octopus
Oenpelli Python	Oilfish	Okapi
Old English Sheepdog	Old House Borer	Oleander Hawk Moth
Olingo	Olive Baboon	Olive Python
Olive Sea Snake	Olm	Olympic Marmot
Onagadori Chicken	Onager	Opabinia
Opah	Opaleye (Rudderfish)	Opossum
Oranda Goldfish	Orange Baboon Tarantula	Orange Dream Ball Python
Orange Roughy	Orange Spider	Orange Tanager
Orange-Crowned Warbler	Orangutan	Orb Weaver
Orchard Oriole	Orchid Dottyback	Oregon Spotted Frog
Ori-Pei	Oribi	Oriental Cockroach
Oriental Dwarf Kingfisher	Orinoco Crocodile	Ornate Bichir
Ornate Black-Tailed Rattlesnake	Ornate Box Turtle	Ornithocheirus
Ornithomimus	Ortolan Bunting	Oscar Fish
Osprey	Ostracod	Ostrich
Otter	Otterhound	Ovenbird
Oviraptor	Owl	Owl Butterfly
Owlfly	Ox	Oxpecker
Oyster	Oyster Toadfish	Ozark Bass

Final Thoughts

That was a lot of animals that start with O! Which one was your favorite? Let us know in the comments. If you enjoyed this list, check out our other animal name articles for more fun facts and learning!