The massive annual spring migration of America's birds – millions of them – is underway. Here's how to follow along at home.

U.S. bird populations are experiencing alarming declines due to factors such as habitat loss and climate change, according to ...

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Some examples of common birds now in decline include the chimney swift, wood thrush, grasshopper sparrow, eastern meadowlark, common grackle, barn swallow, blackpoll warbler, herring gull and ...

The blackpoll warbler songbird can fly as far from Alaska to the Amazon. Exactly how birds know where and when to migrate, especially those that have never made the flight before, is still ...