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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.

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

The first fossils of mammals appeared 178 million years ago during the [[Jurassic]].<ref>Pickrell, J. (2019, October 23). How the earliest mammals thrived alongside dinosaurs. Nature News. Retrieved March 10, 2022, from https://www.nature.com/articles/d41586-019-03170-7#:~:text=Mammals%20first%20appeared%20at%20least,out%2066%20million%20years%20ago.</ref>

[[Category:Vertebrates| ]]

[[Category:Vertebrates| ]]