Title: Ground Squirrel, Alternative Title: (none), Creator: Martin, Joe, Source: WO-067-CD60, Publisher: U.S. Fish and Wildlife Service, Contributor: DIVISION OF PUBLIC AFFAIRS.
Language: EN - ENGLISH, Rights: (public domain), Audience: (general), Subject: mammal, mammals, wildlife, animal, animals, squirrels.
The first-ever genetic delineation of nearly all existing squirrel groups suggests not only some surprising branchings in the squirrels' family tree. The study also reveals strong evidence that geological and climatic change influenced how their ancestors evolved and spread over 36 million years from just one part of ancient North America to nearly all of today's world. - SQUIRRELS' EVOLUTIONARY 'FAMILY TREE' FULL TEXT.
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