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Regina H. Macedo, Carlos A. Bianchi, Communal Breeding in Tropical Guira Cuckoos Guira guira: Sociality in the Absence of a Saturated Habitat, Journal of Avian Biology, Vol. 28, No. 3 (Sep., 1997), pp. 207-215
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Macedo et al. (1997) studied this question.
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