Thomas A. Waite, Effects of Caching Supplemental Food on Induced Feather Regeneration in Wintering Gray Jays Perisoreus canadensis: A Ptilochronology Study, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 21, No. 2 (Jun., 1990), pp. 122-128
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Thomas A. Waite (1990) studied this question.
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