YubaNet reported on a Harvard Study documenting how butterflies are moving north due a warming climate. This unique study analyzed the 19 years of data recorded by an amateur naturalist group, The Massachusetts Butterfly Club.
The findings documented that subtropical and warm-climate species such as the giant swallowtail and zabulon skipper, which had been rare or absent in Massachusetts had the greatest increase in numbers. They also found that over 75% of northerly species, whose range centered in Boston, were declining in numbers. Those species that had overwintered as eggs or small larvae experienced the greatest declines.
Read more at YubaNet Massachusetts butterflies move north as climate warms.