Prothonotary warbler

It has an olive back with blue-grey wings and tail, yellow underparts, a relatively long pointed bill and black legs. The adult male has a bright orange-yellow head; females and immature birds are duller and have a yellow head. In flight from below, the short, wide tail has a distinctive two-toned pattern that is white at the base and dark at the tip. It is the only eastern warbler that nests in natural or artificial cavities, sometimes using old Downy Woodpecker holes. The male often builds several incomplete, unused nests in his territory; the female builds the real nest.