Olav Hogstad, Seasonal Change in Intersexual Niche Differentiation of the Three-Toed Woodpecker Picoides tridactylus, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 8, No. 2 (Nov. 15, 1977), pp. 101-111
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Olav Hogstad (1977) studied this question.
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