Which habitat component do Mourning Warblers strongly prefer in their breeding grounds?

Answer

Thickets and areas with heavy, low vegetation

Mourning Warblers are birds of dense cover, strongly preferring thickets, dense shrubbery, and areas with heavy, low vegetation, often near wet edges or streams in the boreal forest.

Which habitat component do Mourning Warblers strongly prefer in their breeding grounds?
namebirdOriginwarbler