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mammal
source: By Dermoptère-2011-02-02.JPG: *Dermoptère.JPG: Didastephderivative work: Medeis (talk)Desmodusrotundus.jpg: DesmodusOpossum_1_cropped.JPG: *Opossum_1.jpg: Cody Popederivative work: Medeis (talk)Eastern_Grey_Kangaroo.jpg: ТрансаэроFile:Tasmanian devil cropped.jpg: The original uploader was Snowmanradio at English Wikipedia.Leonid_Brezhnev_and_Richard_Nixon_talks_in_1973_cropped.JPG: *File:Bushmen hunters.jpg: Andy Maanoderivative work: Medeis (talk)Elephant_seals_fighting.jpg: Mike Baird, bairdphotos.comFox_squirrel.jpg: Benny MazurTree_Pangolin.JPG: Valerius TygartElephants.jpg: User:FollixPlatypus.jpg: Stefan KraftCaribou_from_Wagon_Trails.jpg: Brian0918Humpback_Whale_fg1_cropped.JPG: *Humpback_Whale_fg1.jpg: Fritz Geller-Grimmderivative work: Medeis (talk)Condylura_cropped.JPG: *Condylura.jpg: work of a National Park Service employeederivative work: Medeis (talk)Giant_armadillo.jpg: The original uploader was Pascaweb at English Wikipedia.Panda_head.jpg: Daniel78Zebras.jpg: Photo taken (in March 2005) and submitted by Walter Voigts.Elephant_Shrew.jpg: user:Ltshearsderivative work: Medeis (talk) - Dermoptère-2011-02-02.JPGDesmodusrotundus.jpgOpossum_1_cropped.JPGEastern_Grey_Kangaroo.jpgFile:Tasmanian devil cropped.jpgBushmen hunters.jpgElephant_seals_fighting.jpgFox_squirrel.jpgTree_Pangolin.JPGElephants.jpgPlatypus.jpgCaribou_from_Wagon_Trails.jpgHumpback_Whale_fg1_cropped.JPGCondylura_cropped.JPGGiant_armadillo.jpgPanda_head.jpgZebras.jpgElephant_Shrew.jpg, CC BY-SA 3.0

noun
a warm-blooded vertebrate animal of a class that is distinguished by the possession of hair or fur, the secretion of milk by females for the nourishment of the young, and (typically) the birth of live young.
哺乳動物
>The first small mammals evolved from reptiles about 200 million years ago, and the group diversified rapidly after the extinction of the dinosaurs to become the dominant form of land animal, with about 4,000 living species. Mammals belong to the class Mammalia, which contains the subclass Prototheria (monotremes) and the infraclasses Metatheria (marsupials) and Eutheria (placental mammals such as rodents, cats, whales, bats, and humans).

ORIGIN
early 19th century: anglicized form (first used in the plural) of modern Latin mammalia, neuter plural of Latin mammalis (adjective), from mamma ‘breast’ (see mamma2).