Birds that devote less time to their offspring engage in more same-sex behaviour.
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References
MacFarlane, G. R., Blomberg, S. P. & Vasey, P. L. Anim. Behav. Advance online publication doi:10.1016/j.anbehav.2010.05.009 (2010).
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Weaver, J. Parental care linked to homosexuality. Nature (2010). https://doi.org/10.1038/news.2010.344
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DOI: https://doi.org/10.1038/news.2010.344