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In this study we examined the relative influence of the color and position of food sources on the feeding patterns of hummingbirds. We studied ruby-throated hummingbirds (Archilochus colubns) in the… Continue Reading
SummaryThe hypothesis that bird flocks orient more accurately than single individuals was tested on homing pigeons. Birds were released both singly and in flocks of three to six. Vanishing bearings… Continue Reading
PURPOSE Gyrate atrophy (GA) is a rare hereditary disease that causes retinal destruction. Retinal damage in GA and other heredodegenerative diseases such as retinitis pigmentosa (RP) releases… Continue Reading
I tested predictions from three models of central place foraging (CPF) in two field experiments with Calliope Hummingbirds (Stellula calliope). The models were based on different "currencies," or… Continue Reading
SummaryThe relative importance of food a vailability and intruder pressure on breeding territorial behavior was studied in two experiments with male calliope hummingbirds. In the first experiment,… Continue Reading