"A new paper by David Toews and Darren Irwin (2008) finds evidence that there are at least two species of Winter Wren in North America rather than the one we previously assumed. Before you groan and say 'oh not another split', you should know that they didn’t split the Winter Wren based on a reading of phylogenetic trees – they split them based on their discovery of a contact zone where the two species don’t hybridize, thus qualifying as species under the strictest Biological Species Concept."
Link: Full article from Biological Ramblings
Winter Wren © 2008 Mike McDowell