Aardla,
Estonia58°
23' 40.6" N 26° 32' 32.4" E25
May 2010, 1717h
Male
breeding call between (1.8 and 2.7 seconds, at 1.3-6.4
kHz); throaty rattle of wooden 'clicks'. In company
of female before taking flight. Several other males
flying continuously between different areas in pursuit
of females (Black-headed Gulls in the background).