Animals that Start with O

Read below for information on 0 different animals that start with the letter O, from ocelot to oyster. The most popular animal that starts with the letter O is the ocelot, a small cat also known as the painted leopard. The least popular O animal is the orangutan. Some can grow to be up to 200lbs, making them one of the largest primates in the world. Some fun facts about letter O name animals are:

Opossums are believed to be immune to some snake venom
With males growing over 9 feet tall, ostriches are the world’s largest bird
Otters hold hands while sleeping to avoid drifting apart while in flowing water

Jump to any letter

Watch on YouTube

Alphabetical List of Animals That Start with O

Animals that Start with O

Oak Toad

The toad doesn't hop.

Oarfish

The Giant oarfish (Regalecus glesne) holds the Guinness Book of World Records for the longest bony fish in the world.

Ocean Perch

As a scorpionfish, the ocean perch has spines along its back!

Ocean Pout

Females guard their eggs for up to 3 months

Ocean Whitefish

Common around Southern California

Oceanic Whitetip Shark

Ocellated Turkey

These birds are timid and hard to spot, but their noisy gobbles give them away.

Ocelot

Also known as the Painted Leopard!

Octopus

There are around 300 different species!

Oenpelli python

Oenpelli pythons are unusually thin for a python.

Oilfish

They live in deep water as far as 2,600 feet below the water’s surface.

Okapi

Eats more than 100 different types of plants!

Old English Sheepdog

Intelligent, sociable and playful!

Old House Borer

Depending on the habitat and climate, these beetles can live between 2 to 10 years, often staying in their larval stage for several years, making them extremely dangerous to wooden structures.

Oleander Hawk Moth

Oleander hawk moth caterpillars feed on the foliage of oleander, an extremely toxic plant to which they are immune.

Olingo

Olingos are part of the raccoon family.

Olive Baboon

Olive baboons will sometimes form strong friendships with each other

Olive python

The olive python is a gentle giant that is rarely aggressive.

Olive Sea Snake

Olive sea snakes can stay underwater for two hours without taking a breath.

Olm

Inhabits dark underwater caves

Olympic Marmot

The Olympic marmot is found in only one location in the United States — the Olympic Mountains in Washington

Onagadori Chicken

The Onagadori, the chicken with the world's longest tail, was declared a Natural Monument of Japan in 1952.

Onager

An onager's coat changes color with the season.

Opabinia

Opabinia had five stalked eyes on its head.

Opah

Opah are brightly colored, with red-orange fins and a silvery body.

Opaleye (Rudderfish)

Some indigenous people of the Pacific coast of North America consider opaleye fish sacred food and use it in traditional ceremonies.

Opossum

Thought to be immune to certain snake venom!

Oranda Goldfish

Oranda goldfish are one of the most popular fancy goldfish breeds

Orange Baboon Tarantula

Their nickname is "Orange Bitey Thing"!

Orange Dream Ball Python

The "Orange Dream" name came from the idea that the morph would make its first breeder a million dollars.

Orange Roughy

One of the oldest commercially harvested fish

Orange Spider

Orange spiders make vertically-oriented webs for catching prey.

Orange Tanager (Orange-Headed Tanager)

They inhabit the lowlands of the Amazon rainforest

Orange-Crowned Warbler

Often mistaken for the Tennessee Warblers, which are equally dull.

Orangutan

Shares 97% of its DNA with humans!

Orb Weaver

Females are about four times the size of males

Orchard Oriole

They use rapid wingbeats to hover over foliage as they search for food.

Orchid Dottyback

This fish camouflages as its prey's parents to trick it into becoming dinner.

Oregon Spotted Frog

Oregon spotted frogs are the most endangered frogs in Canada!

Ori-Pei

Ori-Pei's are born with short noses, which causes them to grunt and make a lot of noise when they breathe.

Oribi

Males oribis spend most of their time patrolling the borders of their territories; they can do this about 16 times an hour! However, 27% of their day is spent grazing.

Oriental Cockroach

Unlike other cockroach species that live indoors living off humans, oriental cockroaches are outdoor scavengers.

Oriental Dwarf Kingfisher

They are one of the smallest kingfishers!

Orinoco Crocodile

Orinoco crocodiles are the largest predators in South America; they're also going extinct!

Ornate Bichir

The ornate bichir can survive outside water for short periods of time

Ornate Black-Tailed Rattlesnake

Ornate black-tailed rattlesnake mothers stay with their newborn babies for up to a month.

Ornate Box Turtle

One of the biggest threats to the orate box turtle population is that when during extremely hot or cold breeding season a vast majority of the hatchlings are of one sex.

Ornithocheirus

Scientists once considered the Ornithocheirus an ancestor to modern birds

Ornithomimus

Ornithomimus translates from Greek to mean “bird mimic.”

Ortolan Bunting

The tradition of hiding your face with a napkin or towel while eating this bird was begun by a priest who was a friend of the great French gastronome Jean Anthelme Brillat-Savarin.