Soft song is a reliable signal of aggressive intent in song sparrows
Templeton, Christopher N. ; Akçay, Çaǧlar ; Campbell, S. Elizabeth ; Beecher, Michael D.
Behavioral ecology and sociobiology, 2012-11, Vol.66 (11), p.1503-1509 [Periódico revisado por pares]Berlin/Heidelberg: Springer
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