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Geographic variation in birdsong and differential responses of territorial males to local and non‐local song variants have been documented in a number of songbird species in which males learn their songs through imitation. Here, we investigated geographic song variation and responses to local and non‐local song in the grasshopper sparrow (Ammodramus savannarum), a species in which males develop song...
Adult male grasshopper sparrows sing two structurally and functionally distinct songs: buzz song and warble song. To investigate how these songs develop, we tutored three groups of young males in the laboratory: one with recordings, one with live adult tutors and one with no song (isolate birds). We used visual scoring of spectrograms, principal components analysis of acoustic measures and spectrogram...
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