Their breeding habitat is wet northern woods, especially spruce bogs, across Canada and the northeastern United States. They breed in boreal coniferous forests, bogs, swamps, and peatlands with a thick cover of moss and an understory of shrubs and saplings. In Canada they frequent stands of black spruce with heath, blueberries, laurel, rhododendron, and Labrador tea in the understory, but they also use wet boreal forests and deciduous patches near streams. During migration they use deciduous forests, thickets, and forest edges.
Yellow-bellied Flycatchers won’t visit your feeder and aren’t likely to nest in your backyard, but you can still provide habitat for them during migration. Native trees and shrubs tend to host more insects than non-native plants and these insects will help fuel them on their way to and from their breeding and wintering grounds.
(Image from Wikipedia)