The massive annual spring migration of America's birds – millions of them – is underway. Here's how to follow along at home.
Migration: in spring, generally arrives earlier than other warblers, returning to northern breeding areas by late April. In fall, generally migrates later than other warblers, peaking in northern ...
The massive annual spring migration of America's birds – millions of them – is underway. Here's how to follow along at home.
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