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Difference between revisions of "Evolution of cetaceans/Definition"

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(New page: <noinclude>{{Subpages}}</noinclude> Whales, dolphins and porpoises are descendants of land-living mammals, and remnants of their terrestrial origins can be found in the fact that they must...)
 
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A definition or brief description of Evolution of cetaceans.

Whales, dolphins and porpoises are descendants of land-living mammals, and remnants of their terrestrial origins can be found in the fact that they must breathe air; their fin bones look like jointed hands; and their spines movement has characteristics of a running mammal.