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mammal
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polar bear and cubs okapi Vertebrate species counts faunal realms Goat herding Steller's sea cow bottlenose dolphins journey of a fertilized egg embryonic development leopard
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polar bear and cubs
mammal summary
Quizzes
Dromedary camels (Camelus dromedarius). Animals, mammals.
Ultimate Animals Quiz
Sea otter (Enhydra lutris), also called great sea otter, rare, completely marine otter of the northern Pacific, usually found in kelp beds. Floats on back. Looks like sea otter laughing. saltwater otters
Animal Group Names
Lion (panthera leo)
Deadliest Animals Quiz
Young chimpanzee dressed in a shirt and sweater vest, scratching his head thinking. (primates)
Wild Words from the Animal Kingdom Vocabulary Quiz
The cheetah is the fastest land animal over short distances. It has become an endangered species in Africa, and is almost extinct in Asia. Cheetah mother with young. Cheetah cubs
Moms of the Animal Kingdom Quiz
Related Questions

mammal: Facts & Related Content

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News •

From biting flies to feathered dinosaurs, scientists reveal 70 new species • Dec. 20, 2025, 12:06 AM ET (ScienceDaily)

Facts

Also Known As Mammalia

Photos and Videos

polar bear and cubs
okapi
faunal realms
Goat herding
Steller's sea cow
bottlenose dolphins
journey of a fertilized egg
embryonic development
leopard
Yellowstone wolf pack
Small squirrel peeking out of a snowy bank, with a blue circle surrounding it.
Collage showing a dog plus a saber-toothed cat equaling a prehistoric, quadrupedal creature with thick limbs and dark, hairless skin.
Which mammals have the shortest and longest gestations
See All Videos, Images and Interactives →

Related Topics and References

Topics
Dig Deeper: More Articles That Discuss This Topic

Key People

Karl Ernst, Ritter von Baer
Karl Ernst von Baer
Prussian-Estonian embryologist
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George Gaylord Simpson
American paleontologist
William Henry Flower
William Henry Flower
British zoologist
Purkinje, Jan Evangelista
Jan Evangelista Purkinje
Czech physiologist
Voit, Carl von
Carl von Voit
German physiologist
Baird, Spencer Fullerton
Spencer Fullerton Baird
American naturalist
default image
Steen Willadsen
Danish embryologist
default image
Geoffrey Bourne
American anatomist
William Diller Matthew
William Diller Matthew
Canadian-American paleontologist
default image
Reginald Innes Pocock
English zoologist
Reinier de Graaf, engraving by an unknown artist
Reinier de Graaf
Dutch physician
default image
John Bachman
American naturalist and minister

Related Quizzes

Lion (panthera leo)
Deadliest Animals Quiz
Nine-Banded Armadillo.
A Is for Animal Quiz
Mute swan with cygnet. (birds)
Match the Baby Animal to Its Mama Quiz
Giraffe standing in grass, Kenya.
Know Your Mammals Quiz
The cheetah is the fastest land animal over short distances. It has become an endangered species in Africa, and is almost extinct in Asia. Cheetah mother with young. Cheetah cubs
Moms of the Animal Kingdom Quiz
The cheetah is the fastest land animal over short distances. It has become an endangered species in Africa, and is almost extinct in Asia. Cheetah mother with young. Cheetah cubs
Moms of the Animal Kingdom Quiz
Lion (panthera leo)
Deadliest Animals Quiz
Sea otter (Enhydra lutris), also called great sea otter, rare, completely marine otter of the northern Pacific, usually found in kelp beds. Floats on back. Looks like sea otter laughing. saltwater otters
Animal Group Names
The bearded vulture (Gypaetus barbatus) is seen in Switzerland on December 2024
Animal Factoids
Young chimpanzee dressed in a shirt and sweater vest, scratching his head thinking. (primates)
Wild Words from the Animal Kingdom Vocabulary Quiz
Dromedary camels (Camelus dromedarius). Animals, mammals.
Ultimate Animals Quiz