The Karner blue butterfly is a tiny thing, with colorful wings that extend just an inch across and a life that rarely wanders more than 600 feet from where it began. Its caterpillars can only eat wild lupines — a flower that’s become less abundant in the wild because of development and habitat fragmentation. As a result, the Karner was named an endangered species in 1992. But Karner blues are getting help from an unlikely source: gun sales.
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