The area I was standing in was alive with Welcome Swallows. They were swooping, turning, diving and just showing why they are such good flyers. They were drinking water occasionally by skimming across the lake's surface but that was too hard to photograph. They would perch on a branch of a dead tree but as I started approaching they would start flying again. I think they may have been eating some of the small flying insects in the reeds based on some of the small objects in the photographs.