Conservation biologist Nick Haddad didn't set out to study rare butterflies. His undergraduate studies didn't focus on butterflies at all. Yet the plight of the St. Francis' Satyr, a butterfly so scarce that it's found in artillery ranges at a single military base in North Carolina, intrigued him and set in motion a decades-long search to find the world's rarest butterflies and determine how best to aid in their recovery. In his new book, "The Last Butterflies: A Scientist's Quest to Save a Rare and Vanishing Creature," Haddad chronicles the stories of six extremely rare