Schwarzkehlchen
Its main call is described as a "hue-tac-tac", the 'tac' softer and less grating than that of the European stonechat; the call is used both for contact between birds and predator alarms. The male has a whistling, crackly but soft song used during the breeding season, consisting of a mixture of soft whistles, tacs and more grating sounds; it is often mimetic, including phrases from the songs of at least 12 other assorted bird species. It sings from a fence, bush, tree or wire, or occasionally from the ground or in flight, between about April and July. On the wintering grounds, it often gives alarm calls but only occasionally sings, being most likely to do so at the end of winter, when starting spring migration.