It's also so impressive how single phrases can be turned into entire complex songs. (metacritic.com)
Males that sang more complex song repertoires, indicated by many different «buzz», «whistle» and «trill» song types, also contributed more to chick feeding. (sciencedaily.com)
For species with complex song, such as the nightingale, the study suggest that females rely on multiple song cues to quickly gather information about their potential partner and inform mating decisions. (sciencedaily.com)