Abstract
birds during winter in north temperate regions is widely recognized (see Morse 1970 for references). However, there have been few attempts to quantify the interspecific relationships of members of foraging flocks. Most previous studies considered foraging behavior of members of the same genus during the breeding season (see Sturman 1968 for references), although Gibb (1954, 1960) discussed the foraging ecology of several species throughout the year, and Morse (1967a, b) studied the foraging ecology of unrelated species in summer and winter, respectively. Notably, Morse (1970) presented extensive data on foraging and interactions of mixed winter flock members in eastern North America.
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