Publisher description for Ravens in winter / Bernd Heinrich ; illustrations by the author.
Bibliographic record and links to related information available from the Library of Congress catalog
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Why should ravens--which are usually solitary birds--share valuable food in the dead of winter? How clever are these birds? Do they have a language? These are some of the riddles that noted sociobiologist Bernd Heinrich, author of Bumblebee Economics and winner of the John Burroughs Medal, explores in this intriguing book. 16 pages of drawings.
Library of Congress subject headings for this publication: Corvus corax Wintering, Corvus corax Behavior