WATERLOO | Skeletal trees shimmer in the fading half-light. Faint rustling turns into a full flap, and large black leaves leap off branches. Hundreds of crows swirl through downtown. Is Alfred ...
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Why do crows gather in large flocks on a tree?
In the evenings, they fly loudly over our cities, circle over parks, and suddenly settle by the hundreds in bare trees. For some, it seems like a scene from a horror movie–for biologists, it’s a ...
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