Biologists walking the trail at the Karner Blue Butterfly Easement in Concord, New Hampshire

5 people walk down a dirt trail carrying mesh cube tents. A sign on the right with a Fish and wildlife shield says "Karner Blue Butterfly Easement"

Biologists walking the trail at the Karner Blue Butterfly Easement in Concord, New Hampshire

Heidi Holman, Maria Tur, and seasonal technicians walk to release butterflies at the Karner Blue Butterfly Easement in Concord, New Hampshire.

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Mason Wheatley/USFWS

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Public Domain

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