Tennessee Warblers forage on slender branches high in the forest canopy, feeding primarily on insects. On their breeding grounds a primary food is a small caterpillar called spruce budworm.

Tennessee Warblers breed in coniferous or mixed deciduous-coniferous forest across Canada. On migration they can occur in most types of forests and woodlands. Winters in second-growth tropical forests.

https://www.allaboutbirds.org/guide/Tennessee_Warbler/id