Unlike many warblers with performance-encoded songs, Type II song bouts of a given male consisted of a single variant. The yellow-rumped warbler has an average length of 14 cm and weight of 12.5 g, its appearance is known to be different across its subspecies groups, especially the two major ones: the coronata group (myrtle warbler) and the auduboni group (Audubon's warbler) intra-group variations are also observed. 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. Yellow-rumped Warblers at Deer Island, photo by Mike Marble. Yellow-rumped Warblers Posted on NovemNovemFull size 6000 × 4000. Both Type I and Type II songs varied considerably among males, and song sharing was uncommon. OBA believes that birding is for everyone, and works to serve the Oregon birding. The Western race of the Yellow-rumped Warbler used to be refered to as Audubons Warbler, the Eastern race was known as the Myrtle Warbler, but the Myrtle race. 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 were used after the dawn chorus. Type I songs were delivered early in the breeding season before females were observed, and differed from the Type II songs delivered in lowlight conditions before sunrise after the arrival of females. Yellow-rumped Warbler, photo by Frank Lospalluto. Photo: Mick Thompson 9. Abstract : We describe the singing behavior of Yellow-rumped Warblers (Setophaga coromta) in southern Oregon. Yellow-rumped Warbler (Myrtle form) showing off its namesake yellow rump.
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