Swallow swarm on the Islands
Walking back, I found myself in a clearing on the south shore, near where the boardwalk begins, late in the afternoon. There were a lot of tiny gnats in the air, and these had attracted dozens of swallows, which were all darting and swooping and chirping madly. I stood in the middle of the clearing and they flew all around me, and just above my head: I was standing in a cloud of swallows. It was impossible to photograph, since they moved so quickly, but I shot a video that maybe gives you some idea:
Photo set here.