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Spring brings flocks of migrating birds from South and Central America to the Pennsylvania. It’s an exciting time for birders who do early morning trips with binoculars to spot the migrants. But a changing climate means some birds, and their songs, could disappear.

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This story is produced in partnership with StateImpact Pennsylvania, a collaboration among The Allegheny Front, WESA, WITF and WHYY to cover the commonwealth's energy economy.

 

Photo (top): Great egrets at the John Heinz National Wildlife Refuge in Philadelphia. Emma Lee/WHYY