A butterfly flits past the window at the Castlewood Canyon Visitor Center, where dozens of volunteers have gathered to learn about Colorado’s declining butterfly population and how they can do their part to save it.
Shiran Hershcovich, a lepidopterist at the Westminster-based Butterfly Pavilion who’s leading the Saturday morning training, ushers the group outside to watch the mourning cloak butterfly as it settles on a blooming tree.
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