Effect of playback treatment on bat activity.

<p>The mean responsiveness (number of passes during playback period–silent period) is shown for <i>M</i>. <i>molossus</i> (blue squares) and <i>S</i>. <i>bilineata</i> (red circles) in response to either <i>M</i>. <i>molossus</i> distress calls or pink noise. Errors bars show standard error of the mean.