Article in Science Magazine (you need a subscription to read it):
http://www.sciencemag.org/content/332/6027/346.abstract
And Atkinson's prior piece (full) in the Proceedings of the Royal Society:
http://rspb.royalsocietypublishing.org/content/early/2010/04/01/rspb.2010.0051.full
PS to S&S's listserv members: Please email me if you wish to continue to receive my posts, as I'll stop sending them to the entire list.