In Mexico's Sea of Cortez sits 142-acre Isla Rasa, nesting habitat for 95% of the world's population of Heermann's gulls and elegant terns. Isla Rasa supports nearly half a million seabirds at height of the nesting season. In the middle of the most productive region of the gulf, where prevailing winds and oceanographic conditions drive an upwelling system that brings cold, nutrient-rich water from the depths to provide plentiful food
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