University of Iowa Press Sivumäärä: 328 sivua Asu: Pehmeäkantinen kirja Painos: Second Edition Julkaisuvuosi: 1999, 01.03.1999 (lisätietoa) Kieli: Englanti
In this work naturalist and ornithologist Alexander Skutch provides detailed accounts of a remarkable aspect of bird behaviour - the aid that one bird gives another who is neither its mater nor its dependent young and who may even belong to a different species.
Illustrated by: D. Gardner Foreword by: Stephen T. Emlen