Playback call measurements.

Median (interquartile range; Q1–Q3) stimulus length (start of first call unit to end of last call unit), call duration (duration from call onset to call offset), inter call interval (time gap between call offset and successive call onset), peak frequency of call (measured from power spectrum), and source level (in dB peSPL re 1 m) of crested coua song, crested coua alarm, Madagascar magpie-robin song, Madagascar magpie-robin alarm, blue-eyed black lemur contact call, blue-eyed black lemur aerial alarm, blue-eyed black lemur terrestrial alarm blue-eyed black lemur agitation call recordings used as playback stimuli.