Texas A&M University Press, 1989. — 275 p. — ISBN 0-89096-466-1.This book reports my observations of American Crows (Corvus brachyrhynchos) on a cattle ranch in Florida where the crows were unusually tame and on a farm in New Hampshire where they were wary, as they are in most places. My aim has been to make a study of all aspects of crow behavior. As often happens, it seems that our commonest birds are the ones most neglected by researchers. When I began this study in 1981, many of the behaviors I have observed, including cooperative breeding, territoriality, storing of food, copulations, play, foraging, interrelations with other animals, allopreening, and various "uncrowlike" vocalizations that I have recorded, had either not been described or had been described in only minimal detail by previous authors. As far as I am aware, the cooperative breeding of American Crows, hitherto almost entirely neglected by ornithologists, is more highly developed in them than in any other bird north of Mexico.
Чтобы скачать этот файл зарегистрируйтесь и/или войдите на сайт используя форму сверху.