Fishes

Fishes are cold blooded animals which breathe through gills and have the simplest skeleton among vertebrates.
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Reptiles

Most of reptiles are carnivorous; they are oviparous though some reptiles like the snake are ovoviviparous.
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Birds

Birds have their body covered with feathers and wings as anterior extremities, they breathe through lungs.
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Mammals

Most of mammals have four legs as extremities which allow them to move from one place to another.
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List of Animals that start with O

Ocelot

Carnivore

Octopus

Omnivore

Okapi

Herbivore

Old English Sheepdog

Balanced food

Olm

Carnivore

Opossum

Omnivore

Orangutan

Omnivore

Ostrich

Omnivore

Otter

Carnivore

Oyster

Omnivore