trending towards significanceP = 0.09
While there was no significant difference between these tracks in vigilance post-playback or in the number of songs sung post-playback (although post hoc analysis comparing the number of songs sung following the two-caller track and three-caller track was trending towards significance ( P = 0.09)), the finding that magpies sing significantly more songs following playback of three but not two callers suggests that they are able to distinguish between two and three callers.