They are classified in four differents groups:
According their ability of moving: Bipeds and Quadrupeds.
Is a form of terrestrial locomotion where an organism moves by means of its two legs. An animal or machine that ususally moves in a bipedal manner is known as a biped.
Is a form of land animal locomotion using four legs. An animal or machine that usually moves in a quadrupedal manner is know as a quadruped, meaning "four feet".
According their body internal structure: Vertebrates and Invertebrates.
Are members of the subphylum vertebra, chordates with backbones and spinal columns.
Is an animal without a backbone.
According their habitat: Terrestrial and Aquatic.
Terrestrial: Is an animal that lives on land opposed to living in water, or sometimes an animal that lives on or near the ground, as opposed to in tress etc.
Aquatic: Is an animal, either vertebrate or invertabrate, wich lives for most or all of its live.
According their feeding: Herbivores and Carnivores
are organisms that eat plants.
Animals that depend solely on animal flesh for their nutrient requierements are considered obligate carnivores while those that also consume non-animal food considered facultative carnivores.