Song type matching is an honest early threat signal in a hierarchical animal communication system

Sing softly and carry a big stick: signals of aggressive intent in the song sparrow

(2011) Çağlar Akçay et al.   ANIMAL BEHAVIOUR

Indirect reciprocity: song sparrows distrust aggressive neighbours based on eavesdropping

(2010) Çağlar Akçay et al.   ANIMAL BEHAVIOUR

Low-amplitude song predicts attack in a North American wood warbler

(2010) David Hof et al.   ANIMAL BEHAVIOUR

How Often Do Animals Lie about Their Intentions? An Experimental Test

(2009) Mark E. Laidre   AMERICAN NATURALIST

Song as an aggressive signal in songbirds

(2009) William A. Searcy et al.   ANIMAL BEHAVIOUR

Reliable aggressive signalling in swamp sparrows

(2008) Barbara Ballentine et al.   ANIMAL BEHAVIOUR

Soft Song in Song Sparrows: Acoustic Structure and Implications for Signal Function

(2008) Rindy C. Anderson et al.   ETHOLOGY