Animal that Start With O

animals whose names begin with O – O is one of the alphabet’s most interesting letters. It is spherical and symmetrical in all directions, among the oldest letters in terms of stability of shape, and it looks lovely and makes amusing noises. It could even have donut-like flavor.

All the animals whose names begin with the letter O are listed along with a brief description. Most of them are just adorable, however others are humorous and some are fierce. Look them up.


The Indonesian term for orangutans, “the man of the forest,” derives from the fact that they are native giant apes to that country.

Living in Sumatra and Kalimantan’s jungles, orangutans are distinguished by their reddish-brown hair and spend the most of their time on trees. For many years, the idea that there was just one type of orangutan was widely held.

The Sumatran, Bornean, and Tapanuli orangutans are three separate species, according to recent findings and study. Due to human actions that imperil their survival, all three of the species are classified as critically endangered species.


These herbivores are often found. Initially, they were discovered in the continents of Asia, Central America, and South America. In the wild, they move in herds and are typically eaten by wolves and bears.

Bollocks are another name for oxen. In their genus, Bos, they are the sole species.

Fun fact: For more than 2500 years, these animals have helped people.


The ocelot (Leopardus pardalis) is a medium-sized, spotted wild cat that weighs between 8 and 15.5 kg and develops to be 40-50 cm (15.7-19.7 in) tall at the shoulders. It may be found throughout the Americas, Asia, and Africa (17.6 and 34.2 lb).

In 1758, Carl Linnaeus published the first account of it. There are two known subspecies. The southwest United States, Mexico, South and Central America, as well as the Caribbean islands of Trinidad and Margarita, are its native habitats.

In the wild, it is threatened. It prefers areas with extensive plant cover, easy access to food, and proximity to water supplies.



Oarfish are long, slender fish that may grow up to 11 meters in length (36 ft.). These enigmatic creatures are rarely observed in the wild.

The largest bony fish in the world is the gigantic oarfish. In contrast to fish like sharks, whose skeletons are formed of a softer substance called cartilage, bony fish have skeletons built of actual bone.


On earth, owls can be found everywhere save Antarctica. They have such amazing survival skills that they can really withstand the icy tundra and scorching deserts.

Of all birds, owls have the most acute hearing and outstanding vision. The majority of the time, owls do not hunt during the day.

They consume anything from insects to huge creatures like foxes and fawns of deer. Even while they are flying, owls have been known to attack other flying creatures, particularly bats. Owls swallow their food whole and then regurgitate the inedible portions, such bones and feathers, unlike other carnivorous birds who rip their prey apart.


These aquatic organisms have a haphazard form. Their round shells are either grey or occasionally white.

Oysters are rich in protein and provide food for many creatures. Oysters are mostly eaten by seagulls, crabs, and occasionally people.

They have eyeballs all throughout their body, fun fact.



The plural form of the noun octopus is an eight-limbed mollusk with a soft body that is a member of the order Octopoda.

About 300 species of the order Cephalopoda are included in the class Cephalopoda together with squids, nautiloids, and cuttlefish. Like other cephalopods, an octopus has two eyes and a beaked mouth in the middle of its eight limbs, which are organized in a Y form. It is also bilaterally symmetrical.

Because of their delicate bodies’ capacity to drastically alter their shape, octopuses may squeeze through narrow openings.

Ocellaris Clownfish

A vibrant marine fish is the ocellaris clownfish. It may be discovered in lagoons and reefs close to Australia and Southeast Asia.

The ritteri anemone, whose tentacles the ocellaris clownfish frequently swims between, and the clownfish share a mutually beneficial connection. The fish is safe from those predatory fish that are vulnerable to the stings since it is immune to the anemone’s stinging tentacles. Fish that consume anemones will be chased away in exchange by the aggressive clownfish.


The okapi, a giraffe’s smaller sister, resides in the remote jungle of the Democratic Republic of the Congo’s northeast. Due to their preference for hiding and the fact that their skin patterns make them the greatest camouflage for rainforest residents, little is known about this species.

Actually, until explorers came across them at the dawn of the 20th century, no one knew that okapi even existed. Okapi consume leaves, much like their taller brother, and have all the digestive organs required to do so.

Oscar fish

The Oscar fish has a 20-year lifespan. It may produce between 250 and 3000 eggs at once, and the color of the progeny differs from that of the parents.

Oscar fish are omnivores that consume both fruits and algae. They could also consume fish and tiny insects.

They are clever and monogamous. As a pet, you would adore one.

Old English Sheepdog

The introduction of early breeds of herding dogs into England led to the development of the large breed of dog known as the Old English Sheepdog.

The breed was once known by the titles B ob-tailed sheep-dog and Shepherd’s Dog. The term “Bob-tail” refers to this breed of dog because it has historically had its nails cut (or Bobtail).

Old English Sheepdogs have the ability to develop thick coats that can cover their faces and eyes and not shed until they are combed.


Northern South America is home to nocturnal oilbirds. Oilbirds are cave dwellers who venture outside at night to gather fruit to eat.

One of the rare bird species that can navigate in the dark using echolocation is the oilbird. They emit high-pitched clicks, and by listening for the echoes, they can determine how close or how far away they are from nearby things.

Owl Butterfly

The wings of an owl butterfly have a design that mimics owl eyes. This butterfly belongs to the genus Caligo and is a native of South America.

While the majority of moths and butterflies employ camouflage to successfully hide from possible hazards and predators.

Owl butterflies defend themselves by impersonating the owl, a bird that is feared for its abilities to combat both terrestrial and aerial butterfly predators (see the Owl section for more detail).

Orca (Killer Whale)

Being a global species, orcas may be found anywhere. Unlike filter-feeder whales, these creatures are known as killer whales, because they have teeth for both shredding and devouring prey.

They are apex predators with a varied diet that includes everything from tiny fish to people.

Fun fact: Blue whales are a common target of killer whales.


The only chordate species identified in Europe that only inhabits caves is the olm, also known as the proteus (Proteus anguinus), an aquatic salamander of the family Proteidae.

Unlike other amphibians, it is entirely aquatic and spends all of its time in the water, even while sleeping, eating, and reproducing. It can only be discovered in caves in the Dinaric Alps, where it is peculiar to the subterranean waters that flow through the enormous limestone bedrock of the area.

Olive Ridley Sea Turtle


The Pacific and Indian seas are home to the olive ridley sea turtle, which is mostly found there. The species takes its name from its olive-green, heart-shaped shell, which reaches a maximum length of 60 cm (2 ft).

Despite being the most widespread sea turtle in the world, the olive ridley sea turtle is listed by the IUCN as Vulnerable.


A carnivorous aquatic mammal with exceptional swimming and diving skills is the otter. They frequently locate their den on riverbanks since they spend the majority of their time in or near water. The only way to enter the den is underwater, which serves as additional security.

They prey mostly on fish, crayfish, frogs, small mammals, and other creatures that inhabit their ecosystem.

Sea otter, the family’s biggest member and a resident of the coastal regions of North America and East Asia, is another member of the Mustelidae (weasel) family, which also contains otter.

Old English sheepdog

These friendly animals are white with grey spots on their fur, which covers their eyes. They make clever, entertaining pets. These dogs often weigh between 60 and 100 pounds.

Fun fact: They were found in southeast England in the nineteenth century. Thus, they are known as Old English.


Opossums are thought to have originated in South America and were brought to North America during the period of continental union known as the Great American Interchange.

They can colonize new land and thrive in a range of settings and temperatures because to a combination of their unspecialized biology, adaptive diet, and reproductive behaviors.

Orb Weaver

Some spiders produce sheet web, which may be vertical or horizontal. On the other hand, other spiders spin web that resembles an orb. The most prevalent example of a sheet weaver is a house spider, whereas a garden spider is an example of the latter.

Orb-weaver spiders, as its name suggests, spin a web that extends outward from all six of their feet. The feet serve as sensors, able to pick up even the smallest disturbance.

The spider will quickly seal the orb and strike its victim with a paralyzing bite if it detects an insect that has entered and been stuck in the sticky web.


The largest bird still alive and having the largest bird egg is the ostrich. Ostriches have wings, yet they are unable to use them to fly. Ostriches do have strong, quick legs that they may utilize for sprinting and kicking away potential dangers and predators.

Ostriches are among the fastest terrestrial animals, with a peak speed of roughly 65 kph (40 mph) while running.

Ostriches once roamed throughout the Middle East and Africa, but owing to human activity, their numbers outside of their native environment in East and Central Africa have drastically decreased today.


This worldly bird’s head is white with a black mask covering its eyes. Except for Antarctica, they may be found in all tropical and temperate climates. Because they consume primarily fish, these birds are often referred to as fishhawks.

Ospreys have wingspans of around 5 feet.


The Otterhound is a large, rough-coated hound that sticks out in a pack and has a strong head. Due to the fact that it was first bred for hunting, it has a robust build, a lot of strength, and lengthy strides.

This enables it to function nonstop for extended periods of time. The Otterhound hunts its prey both on land and in the water, and among other characteristics that set it apart from other hounds are its rough, oily, huge webbed, and double-coated feet.


Orioles refer to two different bird species. Orioles are little birds that belong to the family Oriolidae and are native to the old world (the continents of Europe, Asia, and Africa).

The golden oriole, a stunning yellow bird found all throughout continental Europe, is one of the most well-known members of this species.

The old world orioles and the new world orioles are unrelated. Icterus-genus New World orioles belong to the blackbird family.

Contrary to popular belief, the Eurasian blackbird, which is a common sight in European gardens and forests, is not a member of the blackbird family.


The Middle Eastern and African gemsbok is one of three kinds of the horned antelope known as oryx. Their number has drastically decreased in their natural environment, and now only a few herds are infrequently spotted.

Oryx are recognized for being quick runners and precise thrusters, which aids in their resistance to predator and hunter attacks.

Olive baboon

They are mostly found in Africa. An typical adult may reach a height of three feet, and they have brownish-grey fur. They are omnivores and eat a variety of foods, including fruits and young antelopes. They also have strong ties among one another.

Fun fact: Olive Baboons reach sexual maturity at the age of 35.

Ornate Chorus Frog

The southeast of the United States is the home of the little ornate chorus frog. Its face and sides are covered with black blotches, and its hue can range from green to red to brown. It is often found in pine forests and is around 1.4 in (3.5 cm) long.

Owl Monkey

The moniker “owl monkey” refers to both the animal’s look and behavior. An owl monkey’s facial features are extremely similar to those of an owl, with round, brownish eyes that are surrounded by white hair patches.

The only monkey with this lifestyle, owl monkeys are nocturnal creatures like owls that sleep during the day and feed at night. The owl monkey is a native of the rainforests of South America and goes by the names durukuli or douroucouli.

Oystercatcher (Eurasian)

A large wading bird, the oystercatcher may be found along the shores of Europe, Asia, and North Africa. Its legs and eyes are brilliant red, and its plumage is black and white. It also has a long, brilliant crimson beak.

Despite the name, the oystercatcher does not eat a lot of oysters. The bird instead mostly consumes cockles, mussels, and worms.