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This sparrow nests and winters farther north than any of its close relatives. Despite the name, it is not particularly associated with trees, and many of its nesting areas are on the tundra north of treeline. In winter in the northern states, flocks of Tree Sparrows are common in open country. They often come to bird feeders with Dark-eyed Juncos and other birds. Males may begin singing their musical songs in late winter, before they start their northward migration.