I have some photos of part of the group of 35 Black Terns at Violette's Lock,
soaring up and away in a kettle. A lot of the terns and gulls do this when
leaving the river. I guess they like to get up high to continue their migration.

http://odolep.com/midatlantic%20birds/Black_Tern1.jpg

http://odolep.com/midatlantic%20birds/Black_Tern2.jpg

Dave Czaplak