Figure 2
From: Behavioural response of a migratory songbird to geographic variation in song and morphology
Playback experiment in males. Behavioural response for (a) latency to approach, (b) time spent within 5 m, and (c) number of tail flips in response to European Stonechats from (1) the local population, (2) a population from 90 km distance, (3) a population from 180 km distance, (4) African stonechats, and (5) control stimuli (Winter wren). Males discriminated between local and foreign stimuli by responding more strongly to song of their own population. Box plots represent, from bottom to top: minimum, lower quartile, median, upper quartile and maximum. Dots indicate observations further than one s.d. away from the mean; n =28.