Animals that Start with O

An alphabetical list of Animals Starting with Letter O is listed below.

Ocean Whitefish – Silvery Pacific fish prized by anglers for its mild flavor.
Oceanic Whitetip Shark – Ocean-roaming shark with white-tipped fins and bold temperament.
Oak Toad – Tiny toad from the southeastern U.S. with a high-pitched chirp.
Oarfish – Long, ribbon-like deep-sea fish thought to inspire sea serpent tales.
Ocellated Turkey – Brilliantly colored Central American turkey with eye-spotted feathers.
Ocelot – Small, beautifully spotted wild cat of the American tropics.
Ocean Perch – Red-orange fish found in cold northern Atlantic waters.
Ocean Pout – Eel-like marine fish adapted to icy sea floors.
Octopus – Intelligent, soft-bodied sea creature with eight arms and color-changing skin.
Oenpelli Python – Rare Australian python known for its pale pattern and size.
Oilfish – Deep-sea fish rich in oily flesh, sometimes mistaken for escolar.
Okapi – Forest-dwelling relative of the giraffe with striped legs.
Old English Sheepdog – Large, shaggy herding dog with a gentle disposition.
Old House Borer – Wood-boring beetle that damages structural timbers.
Oleander Hawk Moth – Large, green-patterned moth feeding on oleander plants.
Olingo – Nocturnal rainforest mammal related to kinkajous.
Olive Baboon – Common African monkey with olive-gray fur and complex social life.
Olive Python – Huge nonvenomous snake of northern Australia.
Olive Sea Snake – Venomous marine snake that lives among coral reefs.
Olm – Blind cave salamander that lives entirely underwater.
Olympic Marmot – Fluffy ground squirrel native to Washington’s Olympic Mountains.
Onagadori Chicken – Japanese breed with tail feathers that can grow meters long.
Onager – Wild Asian ass known for speed and endurance.
Opabinia – Extinct Cambrian creature with five eyes and a trunk-like snout.
Opah – Round, colorful deep-sea fish that can regulate its body temperature.
Opaleye (Rudderfish) – Coastal fish with greenish hue and distinct eyes.
Opossum – Marsupial scavenger that plays dead to escape danger.
Oranda Goldfish – Fancy goldfish with a fleshy head growth called a “wen.”
Orange Tanager (Orange-Headed Tanager) – Bright tropical bird with orange crown and blue body.
Orange-Crowned Warbler – Subtle songbird with hidden orange crest.
Orange Baboon Tarantula – Aggressive African tarantula with vivid orange color.
Orange Dream Ball Python – Striking golden-yellow ball python morph.
Orange Roughy – Deep-sea fish with orange skin and long lifespan.
Orange Spider – General term for brightly colored orange arachnids.
Orangutan – Large, intelligent ape from Borneo and Sumatra with reddish fur.
Orb Weaver – Spider that spins large, circular webs to catch insects.
Orchard Oriole – Small North American bird with chestnut plumage.
Orchid Dottyback – Purple reef fish known for boldness and beauty.
Oregon Spotted Frog – Endangered amphibian native to the Pacific Northwest.
Ori-Pei – Wrinkled, loyal crossbreed of Pug and Shar-Pei.
Oribi – Small, slender African antelope with graceful leaps.
Oriental Cockroach – Dark, glossy roach adapted to damp environments.
Oriental Dwarf Kingfisher – Tiny, rainbow-colored kingfisher from Southeast Asia.
Orinoco Crocodile – Critically endangered crocodile from the Orinoco River basin.
Ornate Bichir – Ancient-looking fish with bold markings and lunglike breathing.
Ornate Black-Tailed Rattlesnake – Beautifully patterned rattler found in Mexico.
Ornate Box Turtle – Small North American turtle with yellow-lined shell.
Ornithocheirus – Large flying reptile from the age of dinosaurs.
Ornithomimus – Fast, ostrich-like dinosaur that likely ate plants and insects.
Ortolan Bunting – Small European songbird once eaten as a delicacy.
Oscar Fish – Colorful South American cichlid with bold personality.
Osprey – Fish-eating bird of prey with reversible outer toes.
Ostracod – Tiny shelled crustacean known as a “seed shrimp.”
Ostrich – World’s largest bird, a fast runner but flightless.
Otter – Playful, aquatic mammal that uses tools to open shells.
Otterhound – Large, shaggy scent hound bred for hunting otters.
Ovenbird – Forest warbler that builds domed, oven-like nests.
Oviraptor – Birdlike dinosaur once thought to steal eggs.
Owl – Nocturnal bird of prey with silent wings and forward-facing eyes.
Oyster – Bivalve mollusk that filters seawater and can produce pearls.
Oyster Toadfish – Ugly bottom-dwelling fish with loud grunting call.
Ozark Bass – Small, aggressive freshwater fish native to the Ozark streams.
Owl Butterfly – Large butterfly with eyespots that mimic an owl’s gaze.
Owlfly (Ascalaphidae) – Insect resembling a dragonfly with feathery antennae.
Ox – Strong domesticated bovine used for pulling heavy loads.
Oxpecker – African bird that eats ticks from the backs of large animals.