Fig. 1From: Sex differences in song syntax and syllable diversity in testosterone-induced songs of adult male and female canariesSpectrograms of canary songs after 6 weeks of treatment with steroids. a Female, b male, c typical plastic song from control male with unclear syllable shapes that could not be classified. The different syllable types were catalogued and labeled based on clear and consistent differences in overall temporal–spectral shape that were repeatable across songs both within and between birds. The labels of the different syllable types are indicated above the sonogramsBack to article page