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. 2009 Jun 16;4(6):e5929. doi: 10.1371/journal.pone.0005929

Figure 2. Close resemblance between food begging calls and early subsong.

Figure 2

(A) Food begging bouts (green bars) produced by a juvenile male at PHD25 and similar sounds in that bird's early subsong (red bars) at PHD 39.(B) A closer view of late begging calls and early subsong from the same male. (C). Three acoustic features (mean duration, Wiener entropy, mean frequency) of early subsong (n = 13 males at PHD 40) are more similar to those of late begging calls of males (n = 13; MANOVA, Wilk's Lamda = 0.086, P>0.05; Tukey post-hoc test)) than to those of females (n = 12) (80–85 call and subsong notes per bird) at PHD 25 (see Fig. S3 for detailed analysis).