By Betsy Thorpe
The mission of the National Audubon Society is to conserve and restore natural ecosystems, focusing on birds, other wildlife, and their habitats for the benefit of humanity and the earth’s biological diversity.
A study released by the National Audubon Society study last month revealed that the migration destination of more than 170 species of North America North American birds, is about 35 miles farther north than it was 40 years ago. One bird, the purple finch is now wintering in Milwaukee Wisconsin, more than 400 miles north of Springfield Missouri where it once wintered.
The Audubon Society scientists who conducted the 40 year study say the only explanation for why so many birds over such a broad area are wintering in more northern locales is global warming.