A new study in Conservation Biology analyzed the breeding ranges of North American birds over a 26-year period. The results show that the ranges have shifted northward; coinciding with a period of increasing global temperatures. These results were similar to those found in studies conducted in Great Britain, showing the worldwide extent of these distributional changes.
“It is difficult to predict when or if the forces behind the distributional shifts of birds we report here may lead to extinctions of local populations,” says Hitch. "Birds are extremely mobile which allows them to move in response to climate change; however, prey that birds rely on for survival may not be able to adapt so easily."