Mammals (class Mammalia /məˈmeɪli.ə/) are a clade of endothermic amniotes. Among the features that distinguish them from the other amniotes, the reptiles and the birds, are hair, three middle ear bones, mammary glands in females, and a neocortex (a region of the brain). The mammalian brain regulates body temperature and the circulatory system, including the four-chambered heart. The mammals include the largest animals on the planet, the rorqual whales, as well as some of the most intelligent, such as elephants, some primates and some cetaceans. The basic body type is a four-legged land-borne animal, but some mammals are adapted for life at sea, in the air, in the trees, or on two legs. The largest group of mammals, the placentals, have a placenta which feeds the offspring during pregnancy. Mammals range in size from the 30–40 mm (1.2–1.6 in) bumblebee bat to the 33-meter (108 ft) blue whale.
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- Aardvark
- Ache
- Achernonian
- Aegyptopithecus
- African bush elephant
- African Golden Cat
- African Wild Ass
- African wild dog
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- Agropelter
- Ahool
- Alolan Raichu
- Alolan Rattata
- Alphadon
- Alpine ibex
- Amebelodon
- American black bear
- American Lion
- Ape (Final Fantasy Adventure)
- Apeis stupidius
- Aquaprimatus
- Arctic Hare
- Arie (sea lion)
- Asian Elephant
- Asthma Hound Chihuahua
- Asura-class
- ATI
- Australian sea lion
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- Aye-aye
- Baby Blizzard Bear
- Baird's Tapir
- Balrog
- Bar-Lgura
- Bat (spear of destiny)
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- BB
- Bewear
- Bibarel
- Bidoof
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- Big Chungus
- Bigfoot
- Bigger Chungus
- Black & White Tiger
- Bliblie
- Blink (Diablo)
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- Blue Whale
- Bobcat
- Bog-Rat
- Bosh
- Boss Monster
- Bottlenose dolphin
- Brazilian Gracile Opossum
- Brenchian
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- Bristles
- Brown rat
- Bunyip
- Burmecian
- Cactus Cat
- California Sea Lion
- Canada Lynx
- Candy Cat
- Capybara
- Caracal
- Care Bear
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- Cat (Cucumber Quest)
- Cat O' 9 Tails
- CatDog
- Cathay (Khajiit)
- Catoblepas
- Cattle
- Cave Dweller
- Cheetah
- Chimchar
- Chimer
- Chimpanzee
- Chimpus imbecilus
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- Chinese Mountain Cat
- Chupacabras
- Cleric Beast
- Clouded Leopard
- Colby (sea lion)
- Colocolo
- Columbia River Sand Squink
- Companyball
- Cottontail Rabbit
- Cougar
- Countryball
- Coyote
- Crabeater Seal
- Creature of Metepec
- Critter (Smiling Friends)
- Crobat
- Cryomancer
- Cyberdemon
- Cyclocks
- Cyclops
- Cyclops (Heroes of Might and Magic I)
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- Gazorpian
- Geneva (sea lion)
- Gerenuk
- Giant
- Giant Anteater
- Giant Bat (Godzilla: The Series)
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- Giant Panda
- Giant Rat (Godzilla: The Series)
- Gimlinopithecus
- Glaceon
- Glacier Bear
- Gloom (Diablo)
- Gnawty
- Gnoll (Final Fantasy IX)
- Gnoll (Heroes of Might and Magic III)
- Gnoll (Warcraft)
- Goblin (Ashan)
- Golbat
- Gold Nugcat
- Golduck
- Gorg
- Gray Seal
- Gremlin
- Grinch
- Grizzly bear
- Gruffalo
- Grunka Lunka
- Grunt
- Gruntus not-quite-us
- Guinea pig
- Gumshoos