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1 March 2017 Simultaneous polygyny by a male Black-capped Vireo (Vireo atricapilla) in central Texas
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Abstract

Although polygyny is common and regular among a small proportion of North American songbirds, some socially monogamous passerines may also exhibit occasional polygyny. We present evidence for only the second documented case of polygyny within the Vireonidae and the first documentation for polygyny in the endangered songbird the Black-capped Vireo (Vireo atricapilla). We located two simultaneous nests being tended by the same color-banded male vireo in a territory adjacent to an unpaired male. We suspect that differences in territory quality, rather than male quality, unbalanced sex ratios, or asynchronous settlement, were drivers of polygyny in this example.

Lauren E. Walker and John M. Marzluff "Simultaneous polygyny by a male Black-capped Vireo (Vireo atricapilla) in central Texas," The Wilson Journal of Ornithology 129(1), 212-215, (1 March 2017). https://doi.org/10.1676/1559-4491-129.1.212
Received: 2 November 2015; Accepted: 1 May 2016; Published: 1 March 2017
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