Animals That Start With O: List With Pictures & Facts

The following animals begin with the letter o: list includes images and information. Beginning with the letter o, learn about amazing animals.

Animals That Start With O: Pictures & Facts

A list of amazing creatures, beginning with the letter o, is provided on this page, along with images and fascinating facts about each creature. Several of the creatures have links to more information, images, and videos that you may explore.

Individual species (e.g., well-known taxonomic groups, such as ocelot). The names of these owls begin with the letter O. Each of the separate species has its scientific name and conservation status listed.

List of Animals Beginning With O



The length of an oarfish can reach 11 m (36 ft.), making it a long, thin fish. These enigmatic creatures are only found in small numbers in the wild.

Bony fish are fish whose skeletons are composed of actual bone, unlike cartilage such as sharks. The enormous oarfish is the world’s longest bony fish.

Ocellaris Clownfish

  • Scientific Name: Amphiprion ocellaris
  • Conservation Status: Least Concern

A colorful marine fish, the ocellaris clownfish. Around Australia and Southeast Asia, it can be found on reefs and lagoons.

The ritteri anemone, whose tentacles the ocellaris clownfish is frequently seen swimming in, has a symbiotic relationship with it. The anemone’s stinging tentacles are ineffective against the fish, protecting it from being preyed on by other anemone-sensitive species. In retaliation, anemone-eating fish will be driven away by territorial clownfish.


  • Scientific Name: Leopardus pardalis
  • Conservation Status: Least Concern

The ocelot, a wild cat native to South America and southern North America, is a medium-sized cat. It has a pattern of black dots and lines on its golden coat.

Ocelots hunt small animals, reptiles, and birds mostly at night.


Octopuses are eight-armed snails that live in the sea. They can push themselves through the water using “jet propulsion,” and they crawl or swim depending on their needs. This is done by the animal forcing water out of a tube known as the siphon at very high speeds.

Octopuses are mollusks with eight arms. They can crawl or swim, and use ‘jet propulsion’ to push themselves through the water. The animal forcefully expulsion water through a device known as the siphon, which is located at high speed.


  • Scientific Name: Steatornis caripensis
  • Conservation Status: Least Concern

Oilbirds are nocturnal birds that live in northern South America. Oilbirds dwell in caves during the day and venture out at night to acquire fruit.

One of the few bird species that uses echolocation to find its way around in the dark is oilbirds. They emit high-pitched pops and may sense how close or far they are to things around them by hearing the echoes.


  • Scientific Name: Okapia johnstoni
  • Conservation Status: Endangered

The okapi is a little animal that lives in the Democratic Republic of Congo’s rainforests, which is located in Central Africa. The rest of its body is a deep chestnut brown, with striped legs and hindquarters that resemble a zebra’s coat.

The giraffe is the okapi’s closest relative alive. The Giraffidae family of animals contains both species.

Olive Ridley Sea Turtle

  • Scientific Name: Lepidochelys olivacea
  • Conservation Status: Vulnerable

The olive ridley sea turtle lives mostly in tropical seas in the Pacific and Indian oceans, as do other sea turtles. The species gets its name from the heart-shaped olive-green shell that grows to around 60 cm (2 ft.) in length.

The olive ridley sea turtle is classified as Vulnerable by the IUCN, despite being the world’s most common sea turtle.


The Americas are home to opossums, which are marsupials (pouched creatures). Opossums come in a variety of colors and sizes. The young are born in a primitive state like other marsupials, and develop inside specific pouches in the maternal body, where they mature.

North of Mexico, only the Virginia opossum species is encountered.


Like you and I, Orangutans belong to the hominidae family of great apes. Fruit is the major food of these huge, arboreal (tree-dwelling) apes.

The Sumatran orangutan and the Bornean orangutan are the two types of orangutans. Both species are now considered to be critically endangered. Deforestation is the leading cause of this. To make room for agricultural plantations, much of the orangutan’s rainforest has been destroyed.

Orb Weaver

The orb weavers, also known as araneids, are spiders. They make sticky droplets-covered circular webs. The spider with a bite kills insects that fall into its web, then wraps them in silk before tossing them away.

The third most common spider family, with over 3,000 different orb-weaver spiders species. Orb-weavers are not the only spiders that build circular webs.


  • Scientific Name: Orcinus orca
  • Conservation Status: Insufficient Data

The orcas, formerly known as killer whales, are members of the Delphinidae family of oceanic dolphins.

Killer whales are the top of the food chain, with no natural predators. They pursue whales in packs known as pods and have been observed to target adult whales.


Orioles are a family of birds that split into two groups. In the case of the old world, this is what it means. Orioles are tiny birds that belong to the Oriolidae family of continents (Europe, Asia, and Africa). The golden oriole, a lovely yellow bird that can be found across Continental Europe, is one of the most well-known members of this species.

The old world orioles and the new world orioles are totally unrelated. The genus Icterus belongs to the blackbird family and includes New World orioles.

Surprisingly, the Eurasian blackbird, a ubiquitous sight in Europe’s gardens and woodlands, is not a blackbird!

Ornate Chorus Frog

  • Scientific Name: Pseudacris ornata
  • Conservation Status: Least Concern

A tiny frog native to the southeastern United States, the ornate chorus frog is It has black patches on its face and sides and may be green, red, or brown in color. It is most frequently found in pine woodlands and measures about 1.4 inches (3.5 cm) in length.

Ornate Hawk-Eagle

  • Scientific Name: Spizaetus ornatus
  • Conservation Status: Near Threatened

A big, brightly-colored brown and white eagle named the ornate hawk-eagle. When the bird is enthusiastic, it raises its crest.

The beautiful hawk-eagle, which specializes in tropical woods, can be found throughout Central and South America. It can swallow five times its own weight of prey.


  • Scientific Name: Pandion haliaetus
  • Conservation Status: Least Concern

In the Americas, Europe, Africa, Asia, and Australia, the osprey is a medium-large bird of prey. After a strong, feet-first plunge, it feeds almost entirely on fish, which it catches in its reversible talons.


The world’s largest birds are ostriches. The common ostrich and the Somali ostrich are two types of osthuses. Ostriches are the world’s fastest land birds, with maximum speeds of 70 km/h (43 mph) despite their inability to fly.


The Lutrinae subfamily of the Mustelidae (weasel) family is made up of aquatic predators. Otters have webbed feet and long bodies, as do seals.

The sea otter is the world’s largest and smallest marine mammal. The giant otter is the world’s longest otter.

Several otter species are endangered, including both the sea and the giant otter.


The order Strigiformes (a huge group of animals) includes owls, which are birds of prey. The majority of owls are nocturnal (active at night), and they have evolved specialities for hunting in low-light.

The heads of owls are spherical, and their bodies and eyes are large. For directing sound towards its ears, the feathers around an owl’s face help. Owls, despite their excellent vision, hunt mostly by sound.

Owl Butterfly

The owl-like eye patterns on the undersides of owl butterflies’ wings give them their name. They are a group of huge butterflies. Larger species have a 20 cm (8 in) wingspan. Central and South American rainforests are home to owl butterflies.


Oysters are mollusks that live in the sea. The shells of bivalves are divided into two parts with a hinge, as with all bivalves. Oysters come in a variety of shapes and sizes. Several are eaten and harvested for nourishment. Pearls are produced by pearl oysters, and they are valuable stone-like jewels.

Oystercatcher (Eurasian)

  • Scientific Name: Haematopus ostralegus
  • Conservation Status:  Near Threatened

On Europe’s, Asia’s, and North Africa’s shores, the oystercatcher is a large wading bird. It has crimson legs and eyes, as well as black and white plumage. It has a bright red beak that is also long.

Oysters aren’t a significant part of the oystercatcher’s diet, despite their name. Cockles, mussles, and worms are the primary foods of this bird.

Animals That Start With O: Conclusion

Beginning with o, we hope you’ve discovered some fantastic new creatures on this page.

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