9 September 2021
The first three weeks of September are prime time to see warblers passing through Pittsburgh on fall migration. But finding these small, quiet, often greenish birds among the leaves is difficult.
How to find warblers? Listen for and follow the chickadees. Warblers are often with them.
Learn why in this vintage article: Local and Vocal.
(photo from Wikimedia Commons; click on the caption to see the original)