Figure 1.

Female buff-breasted wrens were significantly more aggressive during pair and female intrusions than male intrusions during both pre-breeding (grey bars) and breeding (white bars) periods (see text for details and sample sizes). (a) Latency (s) to show first response to intrusions. (b) Song initiation rate (songs min⁻¹). (c) Proportion of trial spent within 5 m of the decoy(s). (d) Proportion of trial spent on the decoy cage(s); females never sat on cages during male STIs. The line separates experiments performed on two different groups of females.