Elusive Swainson's warbler now breeds in Pennsylvania, scientists find
Two researchers in Pennsylvania have documented a family of Swainson’s warblers. The songbirds have not been known to breed in the state, and the unusual discovery of the breeding birds and their offspring has thrilled avian experts.
Kara Holsopple of The Allegheny Front reports.
This article was originally published on WBUR.org.
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