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. 2014 Dec 4;14:242. doi: 10.1186/s12862-014-0242-8

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© Sakaluk et al.; licensee BioMed Central Ltd. 2014

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Relative frequency of male house wrens males siring young with different numbers of females (solid bars) and the relative frequency of female house wrens producing young with different numbers of males (open bars).