Reports Of Mysterious Bird Disease Decreasing In Pennsylvania

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Outdoors: Cause of mysterious songbird illness still unknown

Vaccine Makers Are Preparing for Bird Flu - Scientific American

State & Union: Mysterious illness impacting songbirds in Pa., News

Mysterious disease killing Pa. songbirds; investigation underway

More than 1,000 Cases of Mysterious Bird Disease Reported In Pennsylvania

How to report a banded bird!

Mysterious Bird Disease Disappears but Threats Persist - NANPA

Where Have All the House Sparrows Gone?

Mystery' bird illness cases on the decline, Cornell Lab says