This morning when I came into the barn the latest batch of swallow fledglings had found their wings. The first flight brought them all the way to the stall divider a few feet below their nest. Here they perched and waited to have flies and such delivered. It is truly fly-through-delivery. The birds sit quietly until their parents call as they dive into the barn. The little birds explode into whirring wings and wide open beaks and a second later they sit quietly again. Until it all happens again two to three minutes later. When I went back into the barn there was no sign of the little birds. They learn fast and within a day the young ones and the adults are indistinguishable as they flit across the sky around the barn.