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“Dendroica petechia is a New World warbler species; the subspecies group around D. p. aestiva is increasingly treated as good species1 Dendroica aestiva (Yellow Warbler) again. The name for the entire cryptic species complex is Mangrove Warbler, and another group of subspecies is known as Golden Warbler. Sensu lato, they make up the most widespread Dendroica species, breeding in almost the whole of North America and down to northern South America.
Other than in male alternate plumage, all subspecies are very similar. Winter, female and immature birds all have similarly greenish uppersides and are a duller yellow below. Young males soon acquire breast and, where appropriate, head coloration. Females are somewhat duller, most notably on the head." Wikipedia
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September in Birds of Ontario Calendar