Fig. 5
From: Taxonomic status of grey-headed Yellow Wagtails breeding in western China
Vocalisations in grey-headed birds. Dots […] between sonograms denote that time between notes or phrases is compressed. a three single song notes from a male (depicted in Additional file 1: Figure S15), Ebinur Lake, 14 May 2011 (XC616907) (Alexander Hellquist); b two single song notes given by a different male, Ebinur Lake, 14 May 2011 (XC616910) (Alexander Hellquist); c song from the same male giving four-, three- and single-note phrases, Moguhu Lake, 15 May 2018 (XC616923) (Per Alström); d song from male (depicted in Additional file 1: Figure S23) giving three-, two- and single-note phrases, Liuyunhu, 20 May 2011 (XC616918) (Alexander Hellquist); e one call followed by twittering song in male, Urumqi, 11 May 2018 (XC616927) (Per Alström); f one call from female, Ebinur Lake, 14 May 2011 (XC616914) (Alexander Hellquist); g three calls from male (depicted in Additional file 1: Figure S15), Ebinur Lake, 14 May 2011 (XC616907). Note saw-tooth pattern at end of descending part of call, producing a rasping quality (Alexander Hellquist); h: one call from male (depicted in Additional file 1: Figure S16), Ebinur Lake, 14 May 2011 (XC616913) (Alexander Hellquist); i one call from male, Moguhu Lake, 15 May 2018 (XC616922) (Per Alström); j–k two calls from male, Urumqi, 11 May 2018 (XC616924). k is soft without r-sound, like typical calls in e.g. European M. f. thunbergi (Per Alström); l one call from a different male, Urumqi, 11 May 2018 (XC616926) (Per Alström)