Prothonotary warbler

The prothonotary warbler (Protonotaria citrea) is a small songbird of the New World warbler family. It is named for its plumage, which resembles the yellow robes once worn by papal clerks (named prothonotaries) in the Roman Catholic Church.

The prothonotary warbler is the only member of the genus Protonotaria and the only eastern warbler that nests in natural or artificial cavities.

These warblers often move with quick, jerky, movements and will even crawl upside down on sticks or trees. During the spring they are often seen in wetlands gathering nesting material, or food, for their mate.

The prothonotary warbler is 13 cm (5.1 in) long, weighs a mean 14.3 g (0.50 oz), and has a wingspan of 22 cm (8.75 in). It has an olive-coloured 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, white at the base and dark at the tip.