Fig. 6
From: Taxonomic status of grey-headed Yellow Wagtails breeding in western China
Box plot showing notes per second in “fast song type” phrases in Yellow Wagtails of different taxa/geographic regions. For recordings containing multiple phrases from one individual, pace is calculated as average of three song phrases. As evident, the pace of the song in grey-headed birds in Xinjiang aligns with that of Scandinavian M. f. thunbergi as well as with M. f. feldegg and M. f. beema, being slower than in birds in the Siberian Arctic and in M. f. macronyx (cf. Hellquist 2021)