Birds Moving Farther North
The purple finch was the biggest northward mover. Its wintering grounds are now more along the latitude of Milwaukee, Wis., instead of Springfield, Mo. Bird ranges can expand and shift for many reasons, among them urban sprawl, deforestation and the supplemental diet provided by backyard feeders. Researchers say the only explanation for why so many birds over such a broad area are wintering in more northern locales is global warming.
Oh, those lucky northern bird watchers.