The Audubon Society has been conducting a crowd-sourcing project for 112 years. No, that's not a misprint. Starting in 1900 hundreds of volunteers have taken up positions at predetermined locations and counted the various species and birds on one single day of the year (Christmas Day!)
They tracked the decline and resurgence of the American Eagle over several decades, and in the most recent set of data, show that bird species which were susceptible to cold now migrate farther north each year, consistent with "warming."
As their name suggests, the Carolina wren belongs in the South, but Audubon count data has documented that many species have been moving their ranges north an average of a mile per year, for decades. In the debate on climate change, birds have already voted with their wings.
Two years ago, Audubon’s Birds and Climate Change analysis revealed that 58 percent of the species seen during the count were showing up significantly further north than 40 years ago—right in line with charted temperature increases.
http://dotearth.blogs.nytimes.com/2012/01/03/crowd-sourced-science-112-years-and-counting/?src=rechp
It must be that the birds are in cahoots with all those pesky scientists, eh?
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