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Researchers today can follow birds' paths as they fly thousands of miles. But it wasn't always that way. Scroll through more than two centuries of advances in understanding this natural wonder.
Spurred by a mass collision event, Audubon chapters and partners lead a Lights Out program during spring and fall migration.
Recent research reveals that Black Swifts ascend to remarkable heights when the moon is full. Why they do so is more of a mystery.