Massachusetts butterflies move north as climate warms

A new study shows that, over the past 19 years, a warming climate has been reshaping Massachusetts butterfly communities. Subtropical and warm-climate species -- many of which were rare or absent in Massachusetts as recently as the late 1980s -- show sharp increases in abundance. At the same time, more than three quarters of northerly species -- species with a range centered north of Boston -- are now declining in Massachusetts, many of them rapidly.

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