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The Uncompahgre Fritillary Butterfly (Boloria acrocnema) is a species of butterfly in the Nymphalidae family. It is endemic to the United States.. It is the last butterfly to be discovered in North America and was found by two Stanford students working out of the Rocky Mountain Biological Laboratory. It was though to be on the edge of extinction, but a number of additional populations have been found and the early monitoring programs that detected small numbers were found to be inadequate. The population is still consider to be endangered.
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