Animals that Start with O

Read below for information on 22 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:


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Alphabetical List of Animals That Start with O

Animals that Start with O

Oak Toad

Oak Toad Picture
Kingdom
Animalia
Phylum
Chordata
Class
Amphibia
Order
Anura
Family
Bufonidae
Genus
Anaxyrus
Scientific Name
Anaxyrus quercicus

Fun Fact: The toad doesn't hop.

Oak toads are the smallest of the toad species in North America, easily identified by a mid-dorsal, light stripe with variable black and brown spots. They have proportionally large parotoid glands. Most toads have that distinctive round vocal sound. The calling oak toad male has an elongated vocal sac. It extends significantly as they produce […] Read More


Ocelot

Ocelot Picture
Kingdom
Animalia
Phylum
Chordata
Class
Mammalia
Order
Carnivora
Family
Felidae
Genus
Leopardus
Scientific Name
Leopardus pardalis

Fun Fact: Also known as the Painted Leopard!

Ocelot Classification and Evolution The Ocelot is a medium-sized small cat that is native to the jungles of South America. The Ocelot is also known as the Painted Leopard due to the beautifully distinctive markings on its fur as it displays dark rosettes, along with spots and stripes. Similar in colouration to the much smaller […] Read More


Octopus

Octopus Picture
Kingdom
Animalia
Phylum
Mollusca
Class
Cephalopoda
Order
Octopoda
Family
Octopodidae
Scientific Name
Octopus Vulgaris

Fun Fact: There are around 300 different species!

The octopus holds the distinction of being the most intelligent of all invertebrate animals. With the highest brain-to-body-mass ratios of all invertebrates – higher even than those of some vertebrates – the octopus is regarded as the smartest of all invertebrate animals. These cephalopods are intelligent enough to engage in deceitful activities, including pretending to […] Read More


Okapi

Okapi Picture
Kingdom
Animalia
Phylum
Chordata
Class
Mammalia
Order
Artiodactyla
Family
Giraffidae
Genus
Okapia
Scientific Name
Okapia johnstoni

Fun Fact: Eats more than 100 different types of plant!

Okapi Classification and Evolution The Okapi is an elusive, herbivorous animal that is found in a small pocket of tropical mountain forest in central Africa. Despite its Deer-like appearance the Okapi is actually one of the last remaining ancestors of the Giraffe, which is the tallest animal on Earth. Along with having a relatively long […] Read More


Old English Sheepdog

Old English Sheepdog Picture
Kingdom
Animalia
Phylum
Chordata
Class
Mammalia
Order
Carnivora
Family
Canidae
Genus
Canis
Scientific Name
Canis Lupus

Fun Fact: Intelligent, sociable and playful!

With its big shaggy coat, obscured eyes, and white and gray color scheme, the Old English Sheepdog is one of the most recognizable breeds in the world. Its very appearance seems to radiate friendly and approachable energy. This breed originated at some point in the 19th century from the region of Cornwall in southwestern England […] Read More


Olive Baboon

Olive Baboon Picture
Kingdom
Animalia
Phylum
Chordata
Class
Mammalia
Order
Primates
Family
Cercopithecidae
Genus
Papio
Scientific Name
Papio anubis

Fun Fact: Olive baboons will sometimes form strong friendships with each other

“The olive baboon forms one of the most complex social structures in the animal kingdom.” This baboon is a type of old-world monkey (a monkey species from the Eastern Hemisphere) that roams across various habitats of Africa. They have numerous adaptations to help them survive and thrive in different environmental conditions. In this article, you […] Read More


Olive Sea Snake

Olive Sea Snake Picture
Kingdom
Animalia
Phylum
Chordata
Class
Reptilia
Order
Squamata
Family
Elapidae
Genus
Aipysurus
Scientific Name
Aipysurus laevis

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

“Olive sea snakes can stay underwater for two hours without taking a breath” The olive sea snake is sometimes called the golden sea snake or the olive-brown sea snake because of its coloration. It can grow up to six feet long and weigh up to six and a half pounds. It has a venomous bite […] Read More


Olm

Olm Picture
Kingdom
Animalia
Phylum
Chordata
Class
Amphibia
Order
Caudata
Family
Proteidae
Genus
Proteus
Scientific Name
Proteus anguinus

Fun Fact: Inhabits dark underwater caves

“The longest-lived amphibian, the olm can live to be 100 years old!” One of the most fascinating creatures in a world full of fascinating creatures, the olm, like its distant relative the axolotl is a completely aquatic salamander, with gills and tailfins. It is born, lives its long lifespan, and eventually dies in the water. […] Read More


Opossum

Opossum Picture
Kingdom
Animalia
Phylum
Chordata
Class
Mammalia
Order
Didelphimorphia
Family
Didelphidae
Genus
Didelphis
Scientific Name
Didelphis Virginiana

Fun Fact: Thought to be immune to certain snake venom!

Opossums hold the distinction of being the only marsupial that lives in the United States and Canada! Throughout much of United States history, opossums were animals that were widely hunted and consumed by people. Although this remains true in some areas of the southern U.S., these savvy marsupials are now better known as pests due […] Read More


Orang-utan

Orang-utan Picture
Kingdom
Animalia
Phylum
Chordata
Class
Mammalia
Order
Primates
Family
Hominidae
Genus
Pongo
Scientific Name
Pongo pygmaeus, Pongo abelii, Pongo tapanuliensis

Fun Fact: Shares 97% of its DNA with humans!

Orang-utan Classification and Evolution The Orang-utan is one of the largest primates in the world and is the only member of the Great Ape family that is found outside of Africa. There are three species of Orang-utan found in the steamy jungles on the islands Borneo and Sumatra which are the Bornean Orang-utan, the Sumatran […] Read More


Orange-Crowned Warbler

Orange-Crowned Warbler Picture
Kingdom
Animalia
Phylum
Chordata
Class
Aves
Order
Passeriformes
Family
Parulidae
Genus
Leiothlypis
Scientific Name
Leiothlypis celata

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

The orange-crowned warbler is a unique songbird who primarily lives in the western hemisphere. This bird has a high-pitched trill for a song, and males even have different songs to differentiate them from each other. Both parents take care of the young, though only the mother incubates the eggs for just under 2 weeks. Orange-Crowned […] Read More


Orb Weaver

Orb Weaver Picture
Kingdom
Animalia
Phylum
Arthropoda
Class
Arachnida
Order
Araneae
Family
Araneidae

Fun Fact: Females are about four times the size of males

The Orb Weaver is a spider commonly found outside homes, in hedges, tall grasses, and trees. They are a helpful predator who feeds off the pest bugs we don’t like, such as mosquitoes, beetles and other bothersome flying insects. They build elaborate, circular webs and are most often seen in late summer and early fall. […] Read More


Ortolan Bunting

Ortolan Bunting Picture
Kingdom
Animalia
Phylum
Chordata
Class
Aves
Order
Passeriformes
Family
Emberizidae
Genus
Emberiza
Scientific Name
Emberiza hortulana

Fun Fact: 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.

“The Ortolan Bunting is The Little Bird That is Forbidden Food” Of all the weird gastronomic traditions humans indulge in, eating this inoffensive little bird is one of the weirdest and frankly, one of the cruelest. Yet it is a rite of passage for the well-heeled, as can be seen in TV shows such as […] Read More


Oscar Fish

Oscar Fish Picture
Kingdom
Animalia
Phylum
Chordata
Class
Actinopterygii
Order
Perciformes
Family
Cichlidae
Genus
Astronotus
Scientific Name
Astronotus ocellatus

Fun Fact: The Oscar fish has teeth in its throat!

“An Intelligent and companionable fish.” People who own Oscar fish might have bought one or two for their beautiful colors, but soon they’re surprised to see that the fish has a personality. They’ll notice their pet Oscar seems to be watching them as they go about their business. They may even believe that their Oscar […] Read More


Ostrich

Ostrich Picture
Kingdom
Animalia
Phylum
Chordata
Class
Aves
Order
Struthioniformes
Family
Struthionidae
Genus
Struthio
Scientific Name
Struthio camelus

Fun Fact: The largest bird in the world!

The ostrich is among the largest types of birds in the world. The ostrich bird looks like an unusual chimera cooked up in a lab. When writing about the ostrich, the Greek philosopher Aristotle did not know whether to classify it as a bird or a mammal. But in fact, the ostrich belongs to that […] Read More


Otter

Otter Picture
Kingdom
Animalia
Phylum
Chordata
Class
Mammalia
Order
Carnivora
Family
Mustelidae
Genus
Lutra
Scientific Name
Lutra Canadensis

Fun Fact: There are 13 different species worldwide

“Giant otters are notorious chatterboxes“ Just like many people, there are giant otters that are considered chatterboxes for their species. Though they can’t form words, they have a vocabulary that consists of 22 recognizable noises. Each noise is used to address a different type of situation. This is how giant otters effectively communicate with each […] Read More


Otterhound

Otterhound Picture
Kingdom
Animalia
Phylum
Chordata
Class
Mammalia
Order
Carnivora
Family
Canidae
Genus
Canis
Scientific Name
Canis lupus

Fun Fact: Otterhounds have webbed feet making them great swimmers!

Otterhounds have webbed feet and are expert swimmers! The history of this shaggy dog dates all the way back to 14th century England. These dogs were bred to hunt otters and remove them from streams and lakes. This is so otters couldn’t steal the fish away from fishermen in the area. Bloodhounds and French hounds […] Read More


Oviraptor

Oviraptor Picture
Kingdom
Animalia

Fun Fact: Oviraptor means "egg thief" or "egg seizer," though they were quite protective of their own eggs.

The Oviraptor is a genus of oviraptorid dinosaur. The name is Latin for “egg thief,” which is what scientists originally believed it to be. However, additional research suggests that the parents of this species were quite protective, protecting a nest instead of attacking it as food. Oviraptors ruled in big numbers during the late Cretaceous […] Read More


Owl

Owl Picture
Kingdom
Animalia
Phylum
Chordata
Class
Aves
Order
Strigiformes

Fun Fact: The owl can rotate its head some 270 degrees

Owls are exceptional hunters that can spot potential prey from up to half a mile away. The owls are a diverse group of animals that belong to their own separate order. There are more than 200 recognized species all around the world. With their highly developed binocular vision and accurate flying abilities, they have several […] Read More


Ox

Ox Picture
Kingdom
Animalia
Phylum
Chordata
Class
Mammalia
Order
Artiodactyla
Family
Bovidae
Genus
Bos
Scientific Name
Bos taurus

Fun Fact:

“The ox is the heavy-duty machinery of the animal world.” This animal, for the most part, is a domesticated animal. As huge mammals, these creatures once moved in herds. Considered cattle, they transverses North America, India, Asia, Australia, and Africa. While there is the rare wild bull animal, in most of their habitats, oxen are […] Read More


Oyster

Oyster Picture
Kingdom
Animalia
Phylum
Mollusca
Class
Bivalvia
Order
Ostreoida
Family
Ostreidae
Scientific Name
Ostreidae

Fun Fact: Can process up to 10 litres of water an hour!

Oysters make up a family of a large number of salt-water bivalve mollusks. Oysters are marine animals that are often found in brackish habitats. They are very irregular in shape and the valves of some are highly calcified. They belong to the phylum Mollusca. Oysters are animals that eat algae and other food particles that […] Read More


Oyster Toadfish

Oyster Toadfish Picture
Kingdom
Animalia
Phylum
Chordata
Class
Actinopterygii
Order
Batrachoidiformes
Family
Batrachoididae
Genus
Opsanus
Scientific Name
Opsanus tau

Fun Fact: The oyster toadfish can produce poison to protect itself

“The oyster toadfish is also known as the ugly toad.” The oyster toadfish is a strange-looking (some may even say ugly) fish that makes its home in the secluded holes and hiding spots along the shore of the eastern United States. The bumpy skin, long mouth, and bulging eyes have earned it very appropriate comparisons […] Read More



A Ocelot
Ocelot

Also known as the Painted Leopard!

A Old English Sheepdog
Old English Sheepdog

Intelligent, sociable and playful!

Newest Animals that Start with the Letter O

The most recently added Animals that start with the letter O.

A Oviraptor
Oviraptor

Oviraptor means "egg thief" or "egg seizer," though they were quite protective of their own eggs.

A Olive Sea Snake
Olive Sea Snake

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

A Oak Toad
Oak Toad

The toad doesn't hop.

Animals that start with the letter O, including the Ocelot & Old English Sheepdog