Silhouetted against the sun, sandhill cranes glide over the wetlands of Bosque del Apache National Wildlife Refuge in New Mexico. Every winter groups of sandhills migrate from Grays Lake National Wildlife Refuge in Idaho to the warmer climes of Bosque del Apache. Naturalists are concerned that diminishing wetlands are leading the water birds to overpopulate this refuge.[Foto e testo dal sito di National Geographic]
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