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"Endless Meanders, Alagnak River Tributary" Salmon migrate back to their birthplace to spawn, but exactly how they manage to find their home is a mystery. Scientists believe a combination of factors—keeping track of the sun and stars, circadian rhythms, an organic magnet in the brain, and a keen sense of smell—draw the salmon back to the spot where they were born. Photograph by Robert Glenn Ketchum Book Title: Rivers of Life: Southwest Alaska, The Last Great Salmon Fishery Aperture Foundation, Inc. |