This species is closely related to Blackpoll Warbler, but this species has a more southerly breeding range and a more northerly wintering area.
The summer male Bay-breasted Warblers are unmistakable. They have grey backs, black faces, and chestnut crowns, flanks and throats. They also boast of bright yellow neck patches, and their underparts are white. They have two white wing bars, as well.
Breeding females essentially resemble washed out versions of the male. The females are greyish above and white below, with much weaker head patterns. The females also only have chestnut markings on small flank patches, although tiny tints in their grey crowns have been observed.
Non-breeding birds have greenish heads, greenish upperparts and yellowish breasts. The yellow extends to the belly of young birds. The two white wing bars are always present in every stage of life. These birds differ from non-breeding Blackpoll Warblers in the absence of breast streaks.
These birds feed on insects, and the numbers of these birds vary with the abundance of the Spruce Budworm. These birds will also feed on berries and nectar in wintertime.
Their songs are a repetitive high-pitched si si si.
- BirdLife International (2009). "Dendroica castanea". IUCN Red List of Threatened Species. Version 2011.2. International Union for Conservation of Nature. Retrieved 31 May 2012. Database entry includes justification for why this species is of least concern
New World Warblers by Curson, Quinn and Beadle, ISBN 0-7136-3932-6
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