animals start with o

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.AnimalsDefinitions
1OarfishOarfish are large, greatly elongated, pelagic lampriform fish belonging to the small family Regalecidae.
2Ocellaris ClownfishThe 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.
3OcelotThe 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.
4OctopusAn octopus is a soft-bodied, eight-limbed mollusc of the order Octopoda.
5OilbirdThe oilbird, locally known as the guácharo, is a bird species found in the northern areas of South America including the Caribbean island of Trinidad.
6OkapiThe 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.
7Old English SheepdogThe Old English Sheepdog is a large breed of dog that emerged in England from early types of herding dog.
8Olive Ridley Sea TurtleThe olive ridley sea turtle, also known commonly as the Pacific ridley sea turtle, is a species of turtle in the family Cheloniidae.
9OlmThe olm or proteus is an aquatic salamander in the family Proteidae, the only exclusively cave-dwelling chordate species found in Europe.
10OpossumOpossums are members of the marsupial order Didelphimorphia endemic to the Americas.
11OrangutanOrangutans are great apes native to the rainforests of Indonesia and Malaysia.
12Orb WeaverOrb-weaver spiders are members of the spider family Araneidae.
13OrcaThe orca or killer whale is a toothed whale belonging to the oceanic dolphin family, of which it is the largest member.
14OrioleNew World orioles are a group of birds in the genus Icterus of the blackbird family.
15Ornate Chorus FrogThe ornate chorus frog is a species of chorus frog endemic to the Southeastern United States.
16Ornate Hawk-EagleThe ornate hawk-eagle is a fairly large bird of prey from the tropical Americas.
17OryxOryx is a genus consisting of four large antelope species called oryxes.
18OspreyThe osprey, also called sea hawk, river hawk, and fish hawk, is a diurnal, fish-eating bird of prey with a cosmopolitan range.
19OstrichOstriches are large flightless birds of the genus Struthio in the order Struthioniformes, part of the infra-class Palaeognathae.
20OtterOtters are carnivorous mammals in the subfamily Lutrinae.
21OwlOwls are birds from the order Strigiformes, which includes over 200 species of mostly solitary and nocturnal birds of prey typified by an upright stance.
22Owl ButterflyThe owl butterflies are species of the genus Caligo and are known for their huge eyespots, which resemble owls’ eyes.
23OxOxalis triangularis, commonly called false shamrock, is a species of perennial plant in the family Oxalidaceae.
24OysterOyster is the common name for a number of different families of salt-water bivalve molluscs that live in marine or brackish habitats.
25OystercatcherThe oystercatchers are a group of waders forming the family Haematopodidae, which has a single genus, Haematopus.
Animals Start with O

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