Fig. 2. The response of females to model calls based on varying the number of syllables in parts A and B (see Table 1), expressed as the sum of ranks of mean female clicks (see Materials and methods). (A) Reply of female to part B containing 9, 18 and 30 syllables with part C constant, measured as rank sum of mean female clicks. (B) The same measure to varying syllable number in part C with B held constant.