The male Prothonotary Warbler has a bright yellow head and breast with blue gray wings without bars, and a dark bill. The female Prothonotary Warbler is duller in coloring and a lighter bill. It can be difficult to tell from the female. It has a range from the Great Lakes Area to the southeast United States and Gulf Area. It has a habitat in wooded swamp areas. It has a diet of insects and snails. It nests in holes in trees and sometimes in birdhouses.