migration migration

Fernandina's Flicker (Colaptes fernandinae), a woodpecker found only in Cuba. Pete Oxford/Minden Pictures/Corbis hide caption

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Pete Oxford/Minden Pictures/Corbis

U.S. Biologists Keen To Explore, Help Protect Cuba's Wild Places

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A Sandhill Crane flies in at sunset to roost for the night in the wetlands of the Monte Vista Wildlife Refuge in Colorado. Migrating along the same route they've followed for thousands of years, about 25,000 Greater Sandhill Cranes pass through the San Luis Valley in late winter every year. Doug Pensinger/Getty Images hide caption

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Doug Pensinger/Getty Images