Carla P. Catterall, Jiro Kikkawa, Colin Gray, Inter-Related Age-Dependent Patterns of Ecology and Behaviour in a Population of Silvereyes (Aves: Zosteropidae), Journal of Animal Ecology, Vol. 58, No. 2 (Jun., 1989), pp. 557-570
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Catterall et al. (1989) studied this question.
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