This picture was made in the late evening at Vransko Lake, in Croatia.
Vransko Lake is the biggest natural lake of Croatia. The Northwest side of the lake has huge reedbeds, which are home to healthy populations of most of the typical reedbirds. Purple and grey herons are breeding birds, as well as Nightheron, Little Bittern, Pygmy Cormorants, Little Crake, and Great Reed Warblers. In august hundreds of thousands of Swallows and martins use the reedbeds as sleeping roosts, which causes an amazing spectacle in the late evening and early morning.