Mammal

Mammal, any member of the group of vertebrate animals in which the young are nourished with milk from special mammary glands of the mother. In addition to these characteristic milk glands, mammals are distinguished by several other unique features. Hair is a typical mammalian feature, although in many whales it has disappeared except in the fetal stage.

Books

<a href="/book/pinnipeds">Pinnipeds</a>
Malam, John
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<a href="/book/killer-whales-%3A-hunt">Killer whales : on the hunt</a>
Riehecky, Janet
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<a href="/book/blue-whales-close">Blue whales up close</a>
Rake, Jody Sullivan
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