As the sun sets over the Connecticut River, as many as 300,000 Tree Swallows gather on the wing in one huge, tightly choreographed flock. With dusk at hand, the aerobatic flock - now shaped like a tornado - swoops down into the tall reeds. It takes but 15 seconds for the 300,000 birds to vanish into the marsh, where they remain until dawn. Be sure to watch the video. There may be a roost near you. Ask your local Audubon.
Tree Swallow Roost
