Fig. 2. Response rates of razorbills to each of the four types of playback experiments (CkM, chick calls played to adult males; CkF, chick calls played to adult females; MCk, adult male calls played to chicks; and MF, adult males played to adult females) for each of the three assay categories (call, orient and taxis). Response rates include all responses to all playback data (i.e. test and control conditions) and averaged any repeated measures on the same subject before combining data across subjects. Vocal responses were frequent from males and chicks but not from females. Orienting responses were frequent in all classes. Taxis or movement responses were consistently low, except from females receiving male calls.