Mother Jones: Butterflies from the southern US that used to be rare in the northeast are now appearing there on a regular basis. The trend correlates to a warming climate report the authors of a paper in Nature Climate Change.
Subtropical and warm-climate butterflies--including the giant swallowtail (photo above) and the zabulon skipper (photo below)--showed the sharpest population shift to the north. As recently as the late 1980s these species were rare or absent in Massachusetts.
At the same time southern...