Animals Start with O: 25+ Animal List, Definition & Example

Animals are multicellular eukaryotic organisms in the biological kingdom of Animalia. With few exceptions, animals consume organic material, breathe oxygen, can move, can reproduce sexually, and go through an onto genetic stage in which their body consists of a hollow sphere of cells, the blastula, during embryonic development. (Animals start with O)

Over 1.5 million living animal species have been described—of which around 1 million are insects—but we have estimated there are over 7 million animal species in total.

In this article, we will list down some animals start with O.

Animals Start with O

Sr. No.	Animals	Definitions
1	Oarfish	Oarfish are large, greatly elongated, pelagic lampriform fish belonging to the small family Regalecidae.
2	Ocellaris Clownfish	The ocellaris clownfish, also known as the false percula clownfish or common clownfish, is a marine fish belonging to the family Pomacentridae, which includes clownfishes and damselfishes.
3	Ocelot	The ocelot is a medium-sized spotted wild cat that reaches 40–50 cm at the shoulders and weighs between 7 and 15.5 kg on average.
4	Octopus	An octopus is a soft-bodied, eight-limbed mollusc of the order Octopoda.
5	Oilbird	The oilbird, locally known as the guácharo, is a bird species found in the northern areas of South America including the Caribbean island of Trinidad.
6	Okapi	The okapi, also known as the forest giraffe, Congolese giraffe, or zebra giraffe, is an artiodactyl mammal that is endemic to the northeast Democratic Republic of the Congo in central Africa.
7	Old English Sheepdog	The Old English Sheepdog is a large breed of dog that emerged in England from early types of herding dog.
8	Olive Ridley Sea Turtle	The olive ridley sea turtle, also known commonly as the Pacific ridley sea turtle, is a species of turtle in the family Cheloniidae.
9	Olm	The olm or proteus is an aquatic salamander in the family Proteidae, the only exclusively cave-dwelling chordate species found in Europe.
10	Opossum	Opossums are members of the marsupial order Didelphimorphia endemic to the Americas.
11	Orangutan	Orangutans are great apes native to the rainforests of Indonesia and Malaysia.
12	Orb Weaver	Orb-weaver spiders are members of the spider family Araneidae.
13	Orca	The orca or killer whale is a toothed whale belonging to the oceanic dolphin family, of which it is the largest member.
14	Oriole	New World orioles are a group of birds in the genus Icterus of the blackbird family.
15	Ornate Chorus Frog	The ornate chorus frog is a species of chorus frog endemic to the Southeastern United States.
16	Ornate Hawk-Eagle	The ornate hawk-eagle is a fairly large bird of prey from the tropical Americas.
17	Oryx	Oryx is a genus consisting of four large antelope species called oryxes.
18	Osprey	The osprey, also called sea hawk, river hawk, and fish hawk, is a diurnal, fish-eating bird of prey with a cosmopolitan range.
19	Ostrich	Ostriches are large flightless birds of the genus Struthio in the order Struthioniformes, part of the infra-class Palaeognathae.
20	Otter	Otters are carnivorous mammals in the subfamily Lutrinae.
21	Owl	Owls are birds from the order Strigiformes, which includes over 200 species of mostly solitary and nocturnal birds of prey typified by an upright stance.
22	Owl Butterfly	The owl butterflies are species of the genus Caligo and are known for their huge eyespots, which resemble owls’ eyes.
23	Ox	Oxalis triangularis, commonly called false shamrock, is a species of perennial plant in the family Oxalidaceae.
24	Oyster	Oyster is the common name for a number of different families of salt-water bivalve molluscs that live in marine or brackish habitats.
25	Oystercatcher	The oystercatchers are a group of waders forming the family Haematopodidae, which has a single genus, Haematopus.

Animals Start with O

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Animals Start with O

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