This is one of our most widely distributed warblers, nesting from the Arctic Circle to Mexico,
During the peak of migration, Swainson’s Thrushes are often very common in woodlots and parks, lurking in the thickets, slipping into fruiting trees to pluck berries. Like the other brown thrushes, Swainson’s migrate mostly at night, and their distinctive callnotes can be heard from overhead on clear nights during spring and fall.
This bird is found in Tennessee only briefly, during spring and fall migration; but there is no point in giving it a more descriptive name, because the bird itself is nondescript. The male makes up for his plain appearance with a strident staccato song, surprisingly loud for the size of the bird. Nesting in northern forests, the Tennessee Warbler goes through population cycles: it often becomes very numerous during population explosions of the spruce budworm, a favored food.