Richard R. Repasky, Dolph Schluter, Habitat Distributions of Wintering Sparrows Along an Elevational Gradient: Tests of the Food, Predation and Microhabitat Structure Hypotheses, Journal of Animal Ecology, Vol. 63, No. 3 (Jul., 1994), pp. 569-582
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Repasky et al. (1994) studied this question.
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