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Richard Buchholz, Douglas J. Levey, The Evolutionary Triad of Microbes, Fruits, and Seed Dispersers: An Experiment in Fruit Choice by Cedar Waxwings, Bombycilla cedrorum, Oikos, Vol. 59, No. 2 (Nov., 1990), pp. 200-204
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Buchholz et al. (1990) studied this question.
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