Evolution of cetaceans/Definition

From Citizendium, the Citizens' Compendium
Jump to: navigation, search
This article is developing and not approved.
Main Article
Talk
Related Articles  [?]
Bibliography  [?]
External Links  [?]
Citable Version  [?]
 
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.