Figure 2From: The effect of hunger on the acoustic individuality in begging calls of a colonially breeding weaver birdEffect of hunger on calls. Spectrograms of representative calls of a 13 days old chick (A) 15 minutes and (B) 120 minutes after food deprivation. Note the two distinct parts of the call and the differing number of trills in the second part of the calls (i.e. one trill in (A) and two trills in (B). Spectrograms are drawn using SAP.Back to article page