Abstract
Replying to Postma, Griffith and Brooks We have shown1that there is little scope for selection on male flycatchers' forehead patch size to drive the evolution of female choice for this ornament indirectly. Postma et al.2question this conclusion, arguing that a female's social partner (that is, realized mate choice) is not a good estimate of her preference, and that our estimates are biased because we do not take patterns of extra-pair paternity into account. However, indirect sexual selection can only operate through realized mate choice, and extra-pair copulations are associated with larger costs than indirect benefits.
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