Ravens in WinterWhy 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. |
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Page 174
... heard trilling and the xylophonelike knocking by two birds obviously play- ing together in flight just before the ravens left the area . Are these courtship sounds ? The trilling is possibly a male assertive call . I heard it in my tame ...
... heard trilling and the xylophonelike knocking by two birds obviously play- ing together in flight just before the ravens left the area . Are these courtship sounds ? The trilling is possibly a male assertive call . I heard it in my tame ...
Page 281
... heard the deep rasping territorial - advertisement calls of the Grahams ' Farm pair at their nest site numerous times throughout the day . Once these calls were almost continuous for half an hour , and they made them near their stand of ...
... heard the deep rasping territorial - advertisement calls of the Grahams ' Farm pair at their nest site numerous times throughout the day . Once these calls were almost continuous for half an hour , and they made them near their stand of ...
Page 282
... heard only one bird yell very briefly . Are the resident pair guarding ? Suddenly a raven makes a few low , soft grunting calls , then another does , and another — and they all take off toward the east as they did yesterday . I think ...
... heard only one bird yell very briefly . Are the resident pair guarding ? Suddenly a raven makes a few low , soft grunting calls , then another does , and another — and they all take off toward the east as they did yesterday . I think ...
Contents
Ravens at a Moose | 41 |
Ravens as Hunters and Scavengers | 48 |
Calling in CarcassOpeners? | 58 |
Copyright | |
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adults already American crow animals aviary bait behavior bill birds fly blue jays breeding cabin cache cage calls carcass chase cliff close common raven communal roost corvids Corvus corax coyote crowd crows dark dawn deep deer display Dixfielders dominant EDGAR ALLAN POE excited feathers feed feet female flew flight flocks food bonanza foraging four Gwinner hawk hear heard hops hypothesis individuals kill kin selection Koyukon land least leave look Maine male marked mate meat pile miles moose morning nearby nest night numbers of ravens observations pair of ravens peck perch pine Pinyon jays predators preens quorks raven comes raven flies raven's nest reciprocal altruism recruitment seems seen share sheep silent single raven snow spruce stay Thor tracks trap trees trills Vermont vocal walk watch weeks wings winter wolves woods yesterday young