Yellow warblers are songbirds, both males and females engage in distinct musical songs. During the breeding season, yellow warblers are extremely territorial, but rejoin small flocks after breeding. Because of their well-built open-cup tree nests, parasitic cowbirds will often lay eggs in yellow warbler nests. However, D. petechia is not always fooled and will cover the intruder's eggs with an additional layer of nesting materials, sometimes burying its own. Yellow warblers are active during the day. (Perrins and Middleton et al. 1985; Rand 1971)
Yellow warblers are migratory birds that breed throughout much of North America and winter primarily from Mexico to northern South America. (Celada et al., 1999)
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