The Blackburnian Warbler (Setophaga fusca) is a small New World warbler. They breed in eastern North America, from southern Canada, westwards to the southern Canadian Prairies, the Great Lakes region and New England, to North Carolina.
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Some articles on Blackburnian warbler:
... Blackburnian Warblers are solitary during winter and highly territorial on their breeding grounds and do not mix with other passerine species outside of the migratory period ... Blackburnian Warblers build a nest consisting of an open cup of twigs, bark, plant fibers, and rootlets held to branch with spider web and lined with lichens ...