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As the sun sets over the Connecticut River, as many as 300,000Â Tree Swallows gather on the wing in one huge, tightly choreographed flock. With dusk at hand, the aerobatic flock â€“ now shaped like a tornado â€“ 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.
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There may be a roost near you.Â Ask yourÂ local Audubon.