The spotted towhee (Pipilo maculatus) is a large New World sparrow. The taxonomy of the towhees has been debated in recent decades, and formerly this bird and the eastern towhee were considered a single species, the rufous-sided towhee. An archaic name for the spotted towhee is the Oregon towhee (Pipilo maculatus oregonus).
The form that breeds on Socorro Island is much smaller than other rufous-sided towhees, and has gray upperparts. It is sometimes split as the Socorro towhee (Pipilo socorroensis). source