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Very widespread in North America, this melodious sparrow is among the most familiar birds in some areas, such as the Northeast and Midwest. At times it is rather skulking in behavior, hiding in the thickets, seen only when it flies from bush to bush with a typical pumping motion of its tail. Usually, however, sheer numbers make it conspicuous. Song Sparrows vary in appearance over their wide range, from large dark birds on the Aleutians to small pale ones in the desert Southwest.