Study: Birds shifting north; global warming cited
Tuesday, February 10, 2009 - 04:21
in Earth & Climate
(AP) -- When it comes to global warming, the canary in the coal mine isn't a canary at all. It's a purple finch. As the temperature across the U.S. has gotten warmer, the purple finch has been spending its winters more than 400 miles farther north than it used to.