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Females and males respond more strongly to duets than to female solos: comparing the function of duet and solo singing in a tropical songbird (Icterus icterus)

In: Behaviour
Authors:
Karan J. Odom Department of Biological Sciences, University of Maryland, Baltimore County, Baltimore, MD 21250, USA
Cornell Laboratory of Ornithology and Department of Neurobiology and Behavior, Cornell University, Ithaca, NY 14850, USA

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Kevin E. Omland Department of Biological Sciences, University of Maryland, Baltimore County, Baltimore, MD 21250, USA

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Abstract

Both females and males of many animals possess elaborate displays, such as solo songs and duets of songbirds. We know little about the function of female song or what selects for duets. To examine their possible functions, we played female solos, duets and a heterospecific control to pairs of troupials (Icterus icterus). Both sexes responded strongly to duets by approaching the playback speaker significantly closer, faster, and more often compared to female solos or the control. Neither sex responded strongly to female solos; troupials approached closer, sang sooner, and duetted more following female solos than the control, but this difference was not significant. Our results indicate that troupial duets pose a greater threat than female solos and female troupial solos are not particularly threatening. Troupial duets may be especially threatening because they indicate the presence of a mated pair, which likely poses a greater territorial threat than lone, unmated birds.

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