A pair of Barred Antshrikes (Thamnophilus doliatus) perched near their nest in French Guiana. Pairs of antshrikes perform vocal duets to defend their territories against rivals. Results of a playback experiment reveal that territorial antshrikes respond more aggressively to duets presented through stereo loudspeakers compared to a single loudspeaker, and that both the male and female display equivalent responses to same–sex and opposite–sex rivals.Photo reproduced by permission of Michel Giraud–Audine.

No abstract is available for this article.