North American bird populations are plummeting, especially in drylands, grasslands and the Arctic where they have historically been most abundant, new research has found.

Analysis of nearly 500 bird species across North America has found that three-quarters are declining across their ranges, ...

In the U.S. peak bird migration during the spring occurs between March 1 and June 15, with some species migrating earlier or later. Alternatively, fall bird migration is typically between Aug. 1 ...

In the U.S. peak bird migration during the spring occurs between March 1 and June 15, with some species migrating earlier or later. Alternatively, fall bird migration is typically between Aug. 1 and ...