We describe the singing behavior of Yellow-rumped Warblers (Setophaga coronata) in southern Oregon. Males used songs of 2 categories. Type I songs were delivered early in the breeding season before females were observed, and differed from the Type II songs delivered in low-light conditions before sunrise after the arrival of females. Both Type I and Type II songs were used after the dawn chorus. Chip-like call notes did not accompany Type II singing in the dawn chorus unlike some warblers with 2 song categories. Both Type I and Type II songs varied considerably among males, and song sharing was uncommon. Songs of Yellow-rumped Warblers were performance encoded; no obvious features with respect to frequency, duration, or syllable structure united the songs within each song category. Unlike many warblers with performance-encoded songs, Type II song bouts of a given male consisted of a single variant.
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Vol. 98 • No. 1