Warming temperatures are pushing 2 chickadee species -- and their hybrids -- northward
e! Science News - Popular science news 2014-03-07
Summary:
The zone of overlap between two popular, closely related backyard birds is moving northward at a rate that matches warming winter temperatures, according to a study by researchers from the Cornell Lab of Ornithology, Villanova University, and Cornell University. The research was published online in Current Biology on Thursday, March 6, 2014.