- Domesticated animals: These animals have been selectively bred and adapted for human use, such as dogs, cats, horses, and cattle.
- Wild animals: These animals live in their natural habitats and have not been domesticated by humans, such as lions, tigers, bears, and elephants.
By Habitat:
- Terrestrial animals: These animals live primarily on land, such as elephants, lions, giraffes, and camels.
- Aquatic animals: These animals live primarily in water, such as fish, dolphins, whales, and sea turtles.
- Amphibious animals: These animals can live both on land and in water, such as frogs, crocodiles, and seals.
By Diet:
- Herbivores: These animals primarily eat plants, such as deer, rabbits, giraffes, and cows.
- Carnivores: These animals primarily eat meat, such as lions, tigers, wolves, and bears.
- Omnivores: These animals eat a variety of both plant and animal matter, such as bears, raccoons, pigs, and humans.
By Locomotion:
- Terrestrial locomotors: These animals primarily move on land, such as mammals and reptiles.
- Aquatic locomotors: These animals primarily move through water, such as fish, whales, and dolphins.
- Aerial locomotors: These animals primarily move through the air, such as birds, bats, and flying insects.
By Social Structure:
- Solitary animals: These animals live alone or in temporary groups, such as tigers, bears, and rhinoceroses.
- Social animals: These animals live in permanent or semi-permanent groups, such as lions, elephants, wolves, and chimpanzees.
By Reproduction:
- Viviparous animals: These animals give birth to live young, such as humans, mammals, and some species of reptiles.
- Oviparous animals: These animals lay eggs, such as birds, reptiles, amphibians, and fish.
- Ovoviviparous animals: These animals retain their eggs internally until they hatch, but do not provide any nutrition to the developing embryos, such as some species of snakes and fish.
By Conservation Status:
- Least concern: These animals are not considered to be threatened or endangered, such as house sparrows and white-tailed deer.
- Near threatened: These animals are close to becoming threatened, but are not yet considered to be endangered, such as African elephants and giant pandas.
- Vulnerable: These animals are facing a high risk of extinction in the wild, such as polar bears and African lions.
- Endangered: These animals are facing a very high risk of extinction in the wild, such as mountain gorillas and Sumatran tigers.
- Critically endangered: These animals are facing an extremely high risk of extinction in the wild, such as the northern white rhinoceros and Amur leopards.