Hooded Warbler — Setophaga citrina
This warbler is olive above and bright yellow below. It has a black hood surrounding a yellow face. It constantly flicks its tail open showing outer white tail feathers. The female's hood is less distinctive. The Hooded Warbler feeds low to the ground and is often found in dense shrubbery of mature deciduous woodlands, often near water. It nests throughout the eastern United States.