Abstract
Most North American hummingbird species are separated from one another during the breeding season by different habitat preferences. In migration, however, different species often share the same habitat. Migrating hummingbirds are usually aggressive and often territorial both interand intraspecifically (Armitage 1955; Cody 1968; Dunford and Dunford 1972, pers. observ.). This was the case on Wheeler Peak in eastern Nevada, where Rufous Hummingbirds (Selasphorus rufus) and Calliope Hummingbirds (Stellula calliope) shared the same habitat and food source. The purpose of this paper is to describe some differences in the means by which these two species exploited the food resource.
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