There are about 4500 species of mammal, all of which feed their young on milk. The largest creatures on Earth today are mammal species, and we ourselves belong to this group.
Mammals are hairy creatures; all of them have at least a few hairs at some point of their development, most are covered head to foot with fur. Mammals are warm-blooded. In other words, they maintain a constant body temperature. As a result, mammals have been able to exploit more habitats than any other animal group, from the deep ocean to the polar ice and desert sands.
Source: Animals visual encyclopedia
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