Fig. 4.
Behavioral responses to probe playbacks in Group 1. Experimental treatment of groups is described in Methods and in Figure 2. (a) Duration of alert behavior following onset of playback. Different letters over columns indicate significant differences based on Bonferroni-adjusted post-hoc pairwise t-test comparisons for significant ANOVAs on log-transformed data. (b) Type of initial responses by juveniles following playback of Squeal Probe 2. (c) Type of initial responses by juveniles following playback of Bird Probe. Data for Squeal Probe 1 (no significant differences) not shown.