Shelley A. Hinsley, Peter Rothery, Paul E. Bellamy, Influence of Woodland Area on Breeding Success in Great Tits Parus major and Blue Tits Parus caeruleus, Journal of Avian Biology, Vol. 30, No. 3 (Sep., 1999), pp. 271-281
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Hinsley et al. (1999) studied this question.
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