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Over several years, photographer and Nat Geo Explorer Rena Effendi traveled to the Armenian-Azerbaijani border in search of Satyrus effendi, a rare butterfly named after her late father, Rustam Effendi—a Soviet Azerbaijani lepidopterist. Only a single generation of these insects is born each year between July and August, making them highly elusive. Still, through her journey, Effendi found herself closer to her father than ever—walking the mountains he loved and meeting those who knew him. Uncov