Animals that start with O
86 animals, sorted from the ones everyone says first to the ones almost nobody thinks of. 28 of them are in the Rare tier or rarer.
- 15 Plankton
- 15 Too Clever
- 28 Schooler
- 17 Rare
- 6 Deep Cut
- 5 One in a Krillion
Rare but real
Names that are easy to defend and hard to guess. Good when you need an answer no one else will have.
- Otter shrew
- Amphibious African insectivorous mammal that resembles an otter.
- Ostariophysi
- In some classifications considered a superorder comprising the Cypriniformes and the Siluriformes.
- Oldwife
- A common long-tailed sea duck of the northern parts of the United States.
- Ord kangaroo rat
- Most widely distributed kangaroo rat: plains and mountain areas of central and western United States.
- Odonate
- Large primitive predatory aquatic insect having two pairs of membranous wings.
- Opossum shrimp
- Shrimp-like crustaceans whose females carry eggs and young in a pouch between the legs.
All 86 animals that start with O
Sorted by search interest, most familiar first. The last column is average monthly US Google searches.
Showing all 86. Tap a name to copy it.
| Name | What it is | Group | ||
|---|---|---|---|---|
| also Old World oriole | Mostly tropical songbird. | Birds | Plankton | 1.2M |
| also Devilfish | Bottom-living cephalopod having a soft oval body with eight long tentacles. | Molluscs | Plankton | 368K |
| Freshwater carnivorous mammal having webbed and clawed feet and dark brown fur. | Mammals | Plankton | 368K | |
| also Bird of Minerva, Bird of night | Nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes. | Birds | Plankton | 368K |
| also Possum | Nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America. | Mammals | Plankton | 301K |
| also Killer whale, Killer, Sea wolf | Predatory black-and-white toothed whale with large dorsal fin. | Mammals | Plankton | 301K |
| Marine mollusks having a rough irregular shell. | Molluscs | Plankton | 301K | |
| also Orang, Orangutang | Large long-armed ape of Borneo and Sumatra having arboreal habits. | Mammals | Plankton | 246K |
| also Fish hawk, Fish eagle | Large harmless hawk found worldwide that feeds on fish and builds a bulky nest often occupied for years. | Birds | Plankton | 246K |
| Fast-running African flightless bird with two-toed feet. | Birds | Plankton | 201K | |
| also Panther cat | Nocturnal wildcat of Central America and South America having a dark-spotted buff-brown coat. | Mammals | Plankton | 165K |
| Similar to the giraffe but smaller with much shorter neck and stripe on the legs. | Mammals | Plankton | 135K | |
| A spider that spins a circular (or near circular) web. | Spiders & arachnids | Plankton | 135K | |
| also Wild ox | Any of various wild bovines especially of the genera Bos or closely related Bibos. | Mammals | Plankton | 135K |
| also King of the herring | Thin deep-water tropical fish 20 to 30 feet long having a red dorsal fin. | Fish | Plankton | 110K |
| also Virginia deer, White tail, Whitetail | Common North American deer. | Mammals | Too Clever | 91K |
| breed | Large sheepdog with a profuse shaggy bluish-grey-and-white coat and short tail. | Mammals | Too Clever | 61K |
| also Pasang | Large African antelope with long straight nearly upright horns. | Mammals | Too Clever | 61K |
| also Oriental roach, Asiatic cockroach, Blackbeetle | Dark brown cockroach originally from orient now nearly cosmopolitan in distribution. | Insects | Too Clever | 33K |
| also Mola, Headfish | Among the largest bony fish. | Fish | Too Clever | 27K |
| also Whitetip shark, White-tipped shark, Carcharinus longimanus | Large deep-water shark with white-tipped dorsal fin. | Fish | Too Clever | 27K |
| European aquatic salamander with permanent external gills that lives in caves. | Amphibians | Too Clever | 27K | |
| also Ortolan bunting | Brownish Old World bunting often eaten as a delicacy. | Birds | Too Clever | 27K |
| also Velvet worm, Peripatus | Any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms. | Other invertebrates | Too Clever | 22K |
| Wild turkey of Central America and northern South America. | Birds | Too Clever | 18K | |
| Black-and-white shorebird with stout legs and bill. | Birds | Too Clever | 18K | |
| breed | Hardy British hound having long pendulous ears and a thick coarse shaggy coat with an oily undercoat. | Mammals | Too Clever | 15K |
| also Catarrhine | Of Africa or Arabia or Asia. | Mammals | Too Clever | 12K |
| Asiatic wild ass. | Mammals | Too Clever | 12K | |
| Small brownish South American birds that build oven-shaped clay nests. | Birds | Too Clever | 12K | |
| Large elliptical brightly colored deep-sea fish of Atlantic and Pacific and Mediterranean. | Fish | Schooler | 9.9K | |
| also Seed shrimp, Mussel shrimp | Tiny marine and freshwater crustaceans with a shrimp-like body enclosed in a bivalve shell. | Crustaceans | Schooler | 8.1K |
| A black plant louse that lives on oaks and dogwoods. | Insects | Schooler | 6.6K | |
| also Rosefish | Large fish of northern Atlantic coasts of America and Europe. | Fish | Schooler | 5.4K |
| breed | English breed of large chickens with white skin. | Birds | Schooler | 5.4K |
| also South American sea lion | Of the southern coast of South America. | Mammals | Schooler | 5.4K |
| also Perissodactyl | Placental mammals having hooves with an odd number of toes on each foot. | Mammals | Schooler | 4.4K |
| Any of various insects having leathery forewings and membranous hind wings and chewing mouthparts. | Insects | Schooler | 4.4K | |
| A cephalopod with eight arms but lacking an internal shell. | Molluscs | Schooler | 3.6K | |
| also Guacharo | Nocturnal fruit-eating bird of South America that has fatty young yielding an oil that is used instead of butter. | Birds | Schooler | 3.6K |
| Very large deep-water snake mackerel. | Fish | Schooler | 3.6K | |
| also Snake, Serpent | Limbless scaly elongate reptile. | Reptiles | Schooler | 3.6K |
| also Asiatic beetle | Introduced into United States from the Orient. | Insects | Schooler | 3.6K |
| also Ornithischian dinosaur | Herbivorous dinosaur with a pelvis like that of a bird. | Reptiles | Schooler | 3.6K |
| also Noctuid moth, Noctuid | Usually dull-colored medium-sized nocturnal moth. | Insects | Schooler | 3.6K |
| Any of various beetles that exude an oily substance from the leg joints that deters enemies. | Insects | Schooler | 2.9K | |
| also Ornithopod dinosaur | Bipedal herbivorous dinosaur. | Reptiles | Schooler | 2.9K |
| Lightly built medium-sized dinosaur having extremely long limbs and necks with small heads and big brains and large eyes. | Reptiles | Schooler | 2.4K | |
| Tiny soft-bodied crab living within the mantle cavity of oysters. | Crustaceans | Schooler | 2.4K | |
| also Pelagic bird | Bird of the open seas. | Birds | Schooler | 1.9K |
| also Oligochaete worm | Hermaphroditic terrestrial and aquatic annelids having bristles borne singly along the length of the body. | Worms | Schooler | 1.9K |
| also Pacific ridley | Olive-colored sea turtle of tropical Pacific and Indian and the southern Atlantic oceans. | Reptiles | Schooler | 1.9K |
| Extinct fish-like jawless vertebrate having a heavily armored body. | Other animals | Schooler | 1.6K | |
| A variety of toadfish. | Fish | Schooler | 1.6K | |
| also Orange horseshoe bat | A common bat of northwestern Australia having orange or yellow fur. | Mammals | Schooler | 1.3K |
| also Blackbird, Merl, Merle | Common black European thrush. | Birds | Schooler | 1.3K |
| Common along northeastern coast of North America. | Fish | Schooler | 1K | |
| Any of several large vultures of Africa and Eurasia. | Birds | Schooler | 1K | |
| also Potamogale | Amphibious African insectivorous mammal that resembles an otter. | Mammals | Rare | 880 |
| Terrestrial porcupine. | Mammals | Rare | 720 | |
| In some classifications considered a superorder comprising the Cypriniformes and the Siluriformes. | Fish | Rare | 720 | |
| also Old squaw | A common long-tailed sea duck of the northern parts of the United States. | Birds | Rare | 590 |
| Most widely distributed kangaroo rat: plains and mountain areas of central and western United States. | Mammals | Rare | 590 | |
| Large primitive predatory aquatic insect having two pairs of membranous wings. | Insects | Rare | 480 | |
| Terrestrial marsupials of southern South America that resemble shrews. | Mammals | Rare | 480 | |
| Shrimp-like crustaceans whose females carry eggs and young in a pouch between the legs. | Crustaceans | Rare | 480 | |
| also Sea-ear | An abalone found near the Channel Islands. | Molluscs | Rare | 480 |
| also Onion louse | Injurious to onion plants and sometimes tobacco. | Insects | Rare | 390 |
| Passerine bird having specialized vocal apparatus. | Birds | Rare | 390 | |
| Asian scops owl. | Birds | Rare | 320 | |
| Advanced carnivorous theropod. | Reptiles | Rare | 320 | |
| also Cephalaspid | Extinct jawless fish of the Devonian with armored head. | Other animals | Rare | 260 |
| Small large-eyed semiaquatic salamander of the United States Northwest. | Amphibians | Rare | 210 | |
| Small game bird with a rounded body and small tail. | Birds | Rare | 110 | |
| also True warbler | Small active brownish or greyish Old World birds. | Birds | Rare | 110 |
| Stork with a grooved bill whose upper and lower parts touch only at the base and tip. | Birds | Deep Cut | 70 | |
| Extremely active cylindrical squid with short strong arms and large rhombic terminal fins. | Molluscs | Deep Cut | 30 | |
| Songbirds having a chattering call. | Birds | Deep Cut | 10 | |
| European scops owl. | Birds | Deep Cut | 10 | |
| Similar to American white pelican. | Birds | Deep Cut | 10 | |
| Any of several East Indian birds. | Birds | Deep Cut | 10 | |
| European toad whose male carries the fertilized eggs wrapped around its hind legs until they hatch. | Amphibians | One in a Krillion | <10 | |
| A European variety of beaver. | Mammals | One in a Krillion | <10 | |
| A coot found in Eurasia. | Birds | One in a Krillion | <10 | |
| A European jay. | Birds | One in a Krillion | <10 | |
| Of Europe. | Mammals | One in a Krillion | <10 |
No animals match. Clear the search or turn a rarity tier back on.
Questions about animals that start with O
How many animals start with O?
RareList lists 86 animals that start with O, including 3 breeds. 15 are in the Plankton tier, the names everyone knows, and 28 are in the Rare tier or rarer.
What are common animals that start with O?
The most searched animals starting with O are Oriole, Octopus, Otter, Owl and Opossum.
What is a rare animal that starts with O?
Old World chat is one of the rarest. Songbirds having a chattering call. It gets about 10 US searches a month. Other rare picks: Otter shrew, Ostariophysi and Oldwife.
How does RareList decide what counts as rare?
Each name is ranked by its average monthly Google searches in the United States. Fewer searches means fewer people are likely to think of it, which is what matters in games that reward unique answers. See how we rank for the details.