Squirrels of the World

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Squirrels of the World Richard W. Thorington, Jr., John L. Koprowski, Michael A. Steele, and James F. Whatton THE JOHNS HOPKINS ...

This book was brought to publication through the generous contri- butions of the Smithso nian Institution, Wilkes University, an ...

Preface vii Taxonomic Introduction Abbreviations vii Paleontology Anatomy Conservation Ecology, Behavior, and Ratufi nae SPEC ...

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Our objective in writing Squirrels of the World is to provide a book that exhibits the great diversity of squirrels, describes s ...

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squirrels of the world ...

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Squirrels constitute a family, the Sciuridae, of the order Ro- dentia, all being descendants of a common ancestor that lived som ...

2 Taxonomic Introduction ring in the Eocene and identifi ed as “fl ying” squirrels are as old as any fossils identifi ed as tree ...

Taxonomic Introduction 3 cies within the genus Ratufa), and the Sciurillinae, which is made up of the South American pygmy squir ...

Squirrels are not well known in the fossil record. However, paleontologists have worked assiduously, screen washing and extracti ...

Paleontology 5 The xerine ground squirrels presently occur mostly in Africa (fi ve species) but are also found in southwest Asia ...

6 Paleontology myoides—developed marmotlike characteristics in the late Miocene (12–5 MYA). They are probably derived from early ...

The largest squirrels living today are the marmots (Marmota) of North America and Asia, including the well-known yellow-bellied ...

8 Anatomy The body proportions of squirrels vary in several ways, most notably in limb lengths and tail length relative to body ...

Anatomy 9 but the muscle (the abductor pollicis) that extends it is con- nected to the thumb, which is minuscule in fl ying squi ...