Recently it was reported that both male and female black

In experiments 1 and 2, we trained black-capped chickadees on an operant discrimination task and tested the PYZD-4409 using songs in which we manipulated acoustic features. We were interested in examining whether these birds use acoustic features in one or both notes within the song, and specifically whether the birds use the fee glissando when discriminating between the sexes. In experiment 3, we trained artificial neural networks (ANNs) using the same stimuli that the birds discriminated in experiment 2.