Non-vocal sound production associated with singing in the Java sparrow (Lonchura oryzivora).During courtship, male Java sparrows coordinate their bill-click sounds with the syntax of their song-note sequences, similar to percussionists.
Credit:
The Songbird as a Percussionist: Syntactic Rules for Non-Vocal Sound and Song Production in Java Sparrows
Masayo Soma , Chihiro Mori
PLoS ONE DOI: 10.1371/journal.pone.0124876
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