Female signal jamming in a socially monogamous brood parasite.

Acoustic signalling is vital to courtship in many animals, yet the role of female vocalizations is understudied. Here, we combine observational and experimental methods to assess the courtship function of the female chatter call in brown-headed cowbirds, . While the chatter call is likely multifunctional, it is frequently used in social interactions and overlapping duets with males during the breeding season.