R. J. Cowie, S. A. Hinsley, Feeding Ecology of Great Tits (Parus major) and Blue Tits (Parus caeruleus), Breeding in Suburban Gardens, Journal of Animal Ecology, Vol. 57, No. 2 (Jun., 1988), pp. 611-626
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Cowie et al. (1988) studied this question.
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