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mammal
Table of Contents
References & Edit History Quick Facts & Related Topics
Images & 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
For Students
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
Read Next
cat. orange and white persian cat with long hair, snarl, growl, teeth
7 Questions About Mammals Answered
sea turtle (reptile). Green turtle (Chelonia mydas) (C. mydas) off the Hawaii Islands, Pacific Islands. Green sea turtle, chelonian. Homepage blog 2011, science and technology, animal
5 Vertebrate Groups
Platypus (Ornithorhynchus anatinus) swimming on the surface of a creek. Water Australia mammal monotreme
Why Is the Platypus a Mammal?
animal. Amphibian. Frog. Anura. Ranidae. Frog in grass.
Abundant Animals: The Most Numerous Organisms in the World
Ruminant. Deer. Red deer. Cervus elaphus. Buck. Stag. Antlers.
9 of the World’s Deadliest Mammals
Discover
African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.
Timeline of the American Civil Rights Movement
earthquake. Heavily damaged school in the town of Yingxiu after a major earthquake struck China's Sichuan Province on May 12, 2008.
The 6 Deadliest Earthquakes Since 1950
Battle of Puebla. Cinco de Mayo. General Porfirio Diaz leads Mexican cavalry to victory against the French lead by General Charles Lorencez at Puebla, Mexico April 2, 1867. Oil on canvas, 1902. May 5, 1862. General Ignacio Zaragoza
Cinco de Mayo
US Marines firing at Fallujah, Iraq, during the Second Battle of Fallujah in November 2004. Operation Iraqi Freedom, Iraq War.
Timeline of the 2000s
Portrait of Marie Antoinette by Jean-Francois Janinet, 1777. Color etching and engraving with gold leaf printed on two sheets, 30x13.5 in.
Did Marie-Antoinette Really Say “Let Them Eat Cake”?
The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)
New Seven Wonders of the World
Computer mapping, woman at early 1990s computer
Timeline of the 1990s

mammal: Facts & Related Content

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News •

Heat triggers sperm activation for fertilization in mammals • May 3, 2025, 3:24 AM ET (News-Medical)
Civet cat caught at Hong Kong shopping centre released into wild after check-up • Apr. 22, 2025, 1:43 AM ET (South China Morning Post)

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
The video thumbnail shows a 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 and Images →

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
George Gaylord Simpson
American paleontologist
Purkinje, Jan Evangelista
Jan Evangelista Purkinje
Czech physiologist
Voit, Carl von
Carl von Voit
German physiologist
Baird, Spencer Fullerton
Spencer Fullerton Baird
American naturalist
Steen Willadsen
Danish embryologist
Geoffrey Bourne
American anatomist
William Diller Matthew
William Diller Matthew
Canadian-American paleontologist
Flower, 1883
Sir William Henry Flower
British zoologist
Reginald Innes Pocock
English zoologist
Reinier de Graaf, engraving by an unknown artist
Reinier de Graaf
Dutch physician
John Bachman
American naturalist and minister

Related Quizzes and Features

Quiz
Lion (panthera leo)
Deadliest Animals Quiz
Nine-Banded Armadillo.
A Is for Animal Quiz
Dromedary camels (Camelus dromedarius). Animals, mammals.
Ultimate Animals Quiz
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
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
vulture. An adult bearded vulture at a raptor recovery center. The Gypaetus barbatus also known as the Lammergeier or Lammergeyer, is a bird of prey and considered an Old World vulture.
Animal Factoids
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
List
Ruminant. Deer. Red deer. Cervus elaphus. Buck. Stag. Antlers.
9 of the World’s Deadliest Mammals
sea turtle (reptile). Green turtle (Chelonia mydas) (C. mydas) off the Hawaii Islands, Pacific Islands. Green sea turtle, chelonian. Homepage blog 2011, science and technology, animal
5 Vertebrate Groups
animal. Amphibian. Frog. Anura. Ranidae. Frog in grass.
Abundant Animals: The Most Numerous Organisms in the World
cat. orange and white persian cat with long hair, snarl, growl, teeth
7 Questions About Mammals Answered