This picture was made in the early morning at Vransko Lake, in Croatia. These swallows were still flying above the reed, before they left in large numbers their roost in the reedbeds and were going to forage in the surroudings.
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. 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.