Animals World

List of animals on letter R

Rabbits, Hares, and Pikas

Rabbits, Hares, and Pikas

Type of animal science: Classification
Fields of study: Anatomy, ecology, evolutionary science, physiology, reproduction science, systematics, wildlife ecology, zoology
At least eighty species of rabbits, hares, and pikas have been identified in the order Lagomorpha. Lagomorphs constitute approximately 2 percent of the known four thousand mammalian species.

Raccoon

Raccoon

Type of animal science: Anatomy, classification, reproduction
Fields of study: Anatomy, zoology
Raccoons are agile arboreal mammals.

Ratfish

Ratfish

Type of animal science: Classification
Fields of study: Anatomy, systematics (taxonomy), zoology
Ratfish is the major subgroup of cartilaginous fishes.

Ray

Ray

Type of animal science: Classification
Fields of study: Anatomy, systematics (taxonomy), zoology
Cartilaginous fishes constitute one of the seven living classes of vertebrates. There are about seven hundred living species of sharks, rays, skates, and ratfishes in this vertebrate group that has ancient origins.

Reindeer

Reindeer

Type of animal science: Anatomy, classification, ecology, reproduction
Fields of study: Anatomy, zoology
Reindeer are deer native to subarctic and arctic regions. Males and females have antlers. Reindeer migrate in herds of up to 200,000. Imported into Alaska and Canada, they are valuable resources.

Rhino

Rhino

Type of animal science:Anatomy, classification
Fields of study: Anatomy, zoology
The five rhinoceros species, in the ungulate family Rhinocerotidae, are among the world’s largest land animals.

Rodents

Rodents

Type of animal science:Classification
Fields of study: Anatomy, vertebrate biology, physiology
About two thousand species of rodents, the gnawing mammals, are classified in the order Rodentia. They are found worldwide, in trees, on the ground, underground, and in partly aquatic environments. Rodents are fur sources, pets, laboratory animals, and pests.

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