Figure 6From: Behavioural response of a migratory songbird to geographic variation in song and morphologyExemplary frequency spectrograms of acoustic stimuli used for the playback experiment. Stimuli strings of European stonechat consisted of songs from members of (a) the local population and from populations at distances of (b) 90 km, and (c) 180 km from the study area. Furthermore, we played back song of (d) African stonechats, and (e) Winter wrens as a control.Back to article page