Jukka Suhonen, Markku Kuitunen, Intersexual Foraging Niche Differentiation within the Breeding Pair in the Common Treecreeper Certhia familiaris, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 22, No. 4 (Oct. - Dec., 1991), pp. 313-318
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Suhonen et al. (1991) studied this question.
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