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What Is a Mammal?

Mammals live on land, at sea, in the air, and under the ground. All mammals, from bats to whales, share a number of important traits that make them different from other animals. Mammals are warm-blooded, they have fur or hair, and most mammals give birth to live young (rather than laying eggs).

• What Is a Mammal?
• Attack and Defend
• What Do Mammals Eat?
• Mating and Having Babies

Name	Type
Nine-banded Armadillo	Armadillo
Big Brown Bat	Bats
Brazilian Free-tailed Bat	Bats
Eastern Pipistrelle	Bats
Hoary Bat	Bats
Little Brown Bat	Bats
Townsend's Big-eared Bat	Bats
American Badger	Carnivores
American Marten	Carnivores
Arctic Fox	Carnivores
Black Bear	Carnivores
Black-footed Ferret	Carnivores
Bobcat	Carnivores
Cat	Carnivores
Cheetah	Carnivores
Common Gray Fox	Carnivores
Common Hog-nosed Skunk	Carnivores
Common Raccoon	Carnivores
Coyote	Carnivores
Dog	Carnivores
Fisher	Carnivores
Giant Panda	Carnivores
Gray Wolf	Carnivores
Grizzly Bear	Carnivores
Jaguar	Carnivores
Kit Fox	Carnivores
Least Weasel	Carnivores
Lion	Carnivores
Long-tailed Weasel	Carnivores
Lynx	Carnivores
Meerkat	Carnivores
Mink	Carnivores
Mountain Lion	Carnivores
Northern River Otter	Carnivores
Ocelot	Carnivores
Polar Bear	Carnivores
Red Fox	Carnivores
Red Wolf	Carnivores
Ringtail	Carnivores
Sea Otter	Carnivores
Striped Skunk	Carnivores
Tiger	Carnivores
Western Spotted Skunk	Carnivores
White-nosed Coati	Carnivores
Wolverine	Carnivores
African Elephant	Hoofed Mammals
American Bison	Hoofed Mammals
Bighorn Sheep	Hoofed Mammals
Black Rhinoceros	Hoofed Mammals
Caribou	Hoofed Mammals
Collared Peccary	Hoofed Mammals
Dall's Sheep	Hoofed Mammals
Elk	Hoofed Mammals
Giraffe	Hoofed Mammals
Hippopotamus	Hoofed Mammals
Moose	Hoofed Mammals
Mountain Goat	Hoofed Mammals
Mule Deer	Hoofed Mammals
Muskox	Hoofed Mammals
Pronghorn	Hoofed Mammals
White-tailed Deer	Hoofed Mammals
Wild Horse	Hoofed Mammals
Zebras	Hoofed Mammals
Blue Whale	Marine Mammals
Bottle-nosed Dolphin	Marine Mammals
California Sea Lion	Marine Mammals
Gray Seal	Marine Mammals
Gray Whale	Marine Mammals
Harbor Seal	Marine Mammals
Humpback Whale	Marine Mammals
Killer Whale	Marine Mammals
Manatee	Marine Mammals
Northern Elephant Seal	Marine Mammals
Northern Fur Seal	Marine Mammals
Northern Right Whale	Marine Mammals
Pacific White-sided Dolphin	Marine Mammals
Saddle-backed Dolphin	Marine Mammals
Short-finned Pilot Whale	Marine Mammals
Sperm Whale	Marine Mammals
Steller Sea Lion	Marine Mammals
Koala	Pouched Mammals
Red Kangaroo	Pouched Mammals
Red-necked Wallaby	Pouched Mammals
Virginia Opossum	Pouched Mammals
Baboons	Primates
Chimpanzee	Primates
Gibbons	Primates
Gorilla	Primates
Lemurs	Primates
Mandrill	Primates
Orangutan	Primates
Patas Monkey	Primates
Slow Lorises	Primates
Squirrel Monkeys	Primates
Antelope Jackrabbit	Rabbits
Black-tailed Jackrabbit	Rabbits
Eastern Cottontail	Rabbits
Snowshoe Hare	Rabbits
White-tailed Jackrabbit	Rabbits
Abert's Squirrel	Rodents and Moles
American Beaver	Rodents and Moles
Black-tailed Prairie Dog	Rodents and Moles
Common Muskrat	Rodents and Moles
Common Porcupine	Rodents and Moles
Deer Mouse	Rodents and Moles
Eastern Chipmunk	Rodents and Moles
Eastern Gray Squirrel	Rodents and Moles
Eastern Mole	Rodents and Moles
House Mouse	Rodents and Moles
Meadow Vole	Rodents and Moles
Norway Rat	Rodents and Moles
Nutria	Rodents and Moles
Ord's Kangaroo Rat	Rodents and Moles
Red Squirrel	Rodents and Moles
Southern Flying Squirrel	Rodents and Moles
Star-nosed Mole	Rodents and Moles
Thirteen-lined Ground Squirrel	Rodents and Moles
Woodchuck	Rodents and Moles
Yellow-pine Chipmunk	Rodents and Moles

Most mammals... are warm-blooded have hair or fur give birth to live young feed their babies with mother's milk

These apply to almost all mammals around the world. However, there are a few exceptions.

Some mammals have barely any hair or fur on their bodies. And there are two mammals that actually lay eggs.