The letter O introduces us to a group of outstanding and often overlooked animals! From the wise owl to the mysterious octopus and the powerful ox, these creatures bring new vocabulary and fascinating facts to your English learning journey.
In this page, you’ll discover two sections, they are list of animals that start with O and animals that start with O with facts and pictures.
List of Animals that Start with O
Below is a helpful list of animals starting with O.
- Ocellaris Clownfish
- Ocelot
- Octopus
- Okapi
- Old English Sheepdog
- Onager
- Opossum
- Orangutan
- Orb Weaver
- Orca
- Oribi
- Oriole
- Oropendola
- Oryx
- Osprey
- Ostrich
- Otter
- Ovenbird
- Owl
- Owl Butterfly
- Ox
- Oyster
- Oystercatcher
- Ozark Big-eared Bat
Animals that Start with O with Facts and Pictures
Ocelot
- Ocelots are small wild cats with beautiful, spotted coats.
- They are nocturnal hunters and very good climbers.
- Ocelots are solitary and very territorial.
Ocelot
/ˈɑsəˌlɑt/
- Example: Ocelots, jaguars, otters, tapirs, harpy eagles, and other endangered species survive there.
Octopus
- Octopuses have eight arms and can change color and texture to camouflage.
- They are very intelligent and can solve puzzles.
- When threatened, they release ink to escape predators.
Octopus
/ˈɑktəˌpʊs/
- Example: The octopus has a poison gland that it uses for killing its prey.
Okapi
- Okapis are relatives of giraffes, not zebras, even though they have striped legs.
- They are very shy forest animals found in the Congo.
- Their long, blue tongues can clean their eyes and ears!
Okapi
/oʊˈkɑːpi/
Example: The okapi is a short-necked primitive cousin of the giraffe.
Old English Sheepdog
- These dogs are known for their thick, shaggy coats and gentle nature.
- They were bred to herd sheep and cattle in England.
- Despite their size, they can be very playful and loving family pets.
Old English Sheepdog
/oʊld ˈɪŋɡlɪʃ ˈʃiːpdɔɡ/
- Example: The Old English Sheepdog originates in Europe where it herded sheep.
Opossum
- Opossums are marsupials, meaning they carry babies in a pouch.
- They “play dead” when scared — this is called “playing possum.”
- Opossums help humans by eating ticks and pests.
Opossum
/əˈpɑsəm/
- Example: We had rabbit and squirrel, too, anything but opossum.
Orangutan
- Orangutans are highly intelligent great apes from Borneo and Sumatra.
- They spend most of their lives in trees, building nests to sleep.
- Orangutans have long arms and are gentle and solitary by nature.
Orangutan
/əˈræŋʊˌtæn/
- Example: The large size and wide-ranging habit of the orangutan make it especially vulnerable to devastation in tropical rainforests.
Orca (Killer Whale)
- Orcas are actually large dolphins, not whales.
- They live in pods and are known for complex communication.
- Orcas are apex predators, meaning they have no natural enemies.
Orca
/ˈɔrkə/
- Example: I suppress an evil wish that an orca will be drawn in by this moving lunchbox of an animal.
Oriole
- Orioles are bright-colored songbirds, often orange and black or yellow.
- They weave hanging, pouch-like nests from string and plant fibers.
- Orioles migrate long distances and are attracted to fruit and nectar.
Oriole
/ˈɔriˌoʊl/
- Example: Oriole is a bird that has black and yellow feathers.
Oropendola
- Oropendolas are tropical birds known for their pendulum-shaped hanging nests.
- Males have flute-like calls that echo through the forest.
- They often nest in colonies high in trees to avoid predators.
Oropendola
/ˌɔrəˈpɛndələ/
- Example: Do you know the black oropendola, or the goldfinch, Tengmalm’s owl that lives in a forest of spruces?
Oryx
- Oryxes are large antelopes with long, straight horns.
- They can survive in hot, dry deserts with little water.
- Oryxes can raise their body temperature to prevent sweating and conserve water.
Oryx
/ˈɔrɪks/
- Example: Oryx and ibex are scarce, but they are there.
Osprey
- Ospreys are large birds of prey that eat almost only fish.
- They can dive feet-first into water to catch fish with their talons.
- Ospreys build huge nests that they reuse year after year.
Osprey
/ˈɑsprɪ/
- Example: Species like the bald eagle, peregrine falcon, and osprey nearly disappeared.
Ostrich
- Ostriches are the largest and heaviest birds on Earth.
- They can’t fly, but they can run up to 45 mph (72 km/h)!
- Ostrich eggs are the largest of any bird species.
Ostrich
/ˈɑstrɪtʃ/
- Example: The ostrich is the fastest animal on two legs.
Otter
- Otters are playful animals that love to slide and swim.
- They use rocks as tools to open shellfish.
- Sea otters hold hands while sleeping to keep from drifting apart.
Otter
/ˈɑtɚ/
- Example: As indeed is the lion, the otter, or the domestic cat when they are out a-hunting.
Owl
- Owls can rotate their heads up to 270 degrees!
- They are silent fliers thanks to special feathers.
- Owls are known for their night vision and excellent hearing.
Owl
/aʊl/
Example: This type of owl prefers a desert habitat.
Ox
- Oxen are strong, domesticated cattle used for pulling loads.
- They are very patient and hardworking, often used in farming.
- Oxen have been used by humans for thousands of years.
Ox
/ɑks/
- Example: Can you tell an ox from a cow?
Oyster
- Oysters are bivalve mollusks found in oceans and bays.
- Some oysters can produce pearls inside their shells.
- They are filter feeders, helping clean the water they live in.
Oyster
/ˈɔɪstɚ/
- Example: I enjoy eating oysters; they’re really delicious.
Oystercatcher
- Oystercatchers are shorebirds with long, bright orange beaks.
- They eat shellfish and worms, using their beaks to pry open shells.
- They make loud, whistling calls, especially when flying.
Oystercatcher
/ˈɔɪstɚˌkætʃɚ/
- Example: Almost a big as an oystercatcher, it is all white with black on the wings and back.
Last Updated on January 10, 2026
