Ridgefield — Josephine Finley, a staff member at the Ridgefield National Wildlife Refuge who lives in Yacolt, is headed for the big island of Hawaii this summer. But it's not (all) a pleasure trip. Beginning in late July, Finley will study the extinction of species and what it takes to save them. It's part of a graduate course she's taking through Miami University of Oxford, Ohio, and its Project Dragonfly, which has joined with a nonprofit called Earth Expeditions. Earth Expeditions brings university students to global "hotspots" to study ecology and conservation in the field. Visit EarthExpeditions.org to learn more.