Fig. 2. (A) Latency to begin hatching and (B) peak of hatching response of Agalychnis callidryas egg clutches in response to vibration playbacks differing in cycle length, plotted in terms of time (open symbols) and of cycles of vibration (closed symbols). All stimuli had a 1:10 ratio of vibration to silence, and were constructed from bursts of 0–100 Hz white noise. Data are means ± s.e.m. of 10 clutches per stimulus. For comparison, latency (s) to begin hatching in snake attacks is also plotted (N=22 attacks).