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'''Mammals''' are a class of [[vertebrate]] animals scientifically known as the Mammalia. They are primarily characterized by the presence of [[mammary glands]] in the female which produce [[milk]] to feed their young, which (except in the case of the [[Monotremes|Monotremata]] which lay eggs), are born live. Mammals are warm-blooded and most are hairy.

'''Mammals''' are a class of [[vertebrate]] animals scientifically known as the Mammalia. They are primarily characterized by the presence of [[mammary glands]] in the female which produce [[milk]] to feed their young, which (except in the case of the [[Monotremes|Monotremata]] which lay eggs), are born live. Mammals are warm-blooded and most are hairy.

The first true mammals appeared in the early [[Jurassic]].

Evolutionary scientists frequently claim that the first true mammals appeared in the early [[Jurassic]].

[[Category:Vertebrates| ]]

[[Category:Vertebrates| ]]