David M. Larson
Winter crow roosts are interesting phenomena. Thousands or tens of thousands of American Crows (Corvus brachyrhynchos) will congregate in winter roosts. Recently, Dana Duxbury-Fox (2018) characterized such a roost of American and Fish (C. ossifragus) crows in Lawrence, Massachusetts, consisting of as many as 16,000 birds. Crows are intelligent social animals that often maintain family groups even during the breeding season. Winter crow roosts provide social interactions, safety in numbers, and possibly information exchange about food resources (Verbeek, 2002). Often, as in Lawrence, roosts are in urban areas, which may provide ample food, few predators, and warmth on cold winter nights.
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