The Mammalogy reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Mammalogy

In biology, mammalogy is the study of mammals, a class of vertebrates with characteristics such as homeothermic metabolism, fur, four-chambered hearts, and complex nervous systems.

Three major subdivisions of mammals are monotremes, marsupials and placentals. An important characteristic for classifying mammals is their dentition: this is because teeth survive the longest after an animal's death.

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