Rachel N. Levin, John C. Wingfield, The Hormonal Control of Territorial Aggression in Tropical Birds, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 23, No. 3, Proceedings of the Symposium Hormones, Physiology and Non-Reproductive Behaviour in Birds, 21-23 August, 1991, Göteborg, Sweden (Jul. - Sep., 1992), pp. 284-291
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Levin et al. (1992) studied this question.
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