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Male's song is remarkably rich and loud for such a small bird. It begins with three or four high, thin notes and then drops to a lower pitched and much fuller warble. You often hear him singing a fragment of his song -- either the first high notes (false start) or the last section of the song. Chatter call is made by both sexes; it may function as a contact call or an alarm call. (Migrating bird; Albany County, New York.)
Habitat: Nests in northern coniferous woods. May be heard singing in a variety of habitats during migration.