Previous studies have described differences in song

Previous studies have described differences in song structure and singing behaviour between male and female songbirds (e.g. Baptista et?al., 1993, Brunton and Li, 2006, Hoelzel, 1986 and Pavlova et?al., 2005), including black-capped chickadees (Hahn, Krysler et al., 2013). In PLX647 current study, we report on the results of sex-based discriminations of black-capped chickadee songs in which we had two primary aims: (1) to determine whether fee-bee songs belong to categories defined by the sex of the singer, and (2) to uncover the underlying mechanism for discriminating male and female songs.