Summary: The climate of the earth is changing rapidly, and birds are responding accordingly. Of the 305 species found in North America in winter, nearly 60% have shifted their ranges northward by an average of 35 miles.
Summary: The climate of the earth is changing rapidly, and birds are responding accordingly. Of the 305 species found in North America in winter, nearly 60% have shifted their ranges northward by an average of 35 miles.