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This time-lapse video shows how Brewer’s sparrows spread north from their winter habitat in the Southwest and Mexico’s Chihuahuan Desert Grasslands to their summer range in the American West. The Cornell Lab of Ornithology produced the maps with computer models that used recorded sightings and habitat data to predict where the birds were likeliest to occur at each point in the year.
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by Cornell Lab of Ornithology, High Country News
September 2, 2013