“The Common Yellowthroat (Geothlypis trichas) is a New World warbler. They are abundant breeders in North America, ranging from southern Canada to central Mexico. Northern races are migratory, wintering in the southern parts of the breeding range, Central America and the West Indies. Southern forms are largely resident. This species is a very rare vagrant to western Europe.
Common Yellowthroats are small songbirds that have olive backs, wings and tails, yellow throats and chests, and white bellies. Adult males have black face masks which stretch from the sides of the neck across the eyes and forehead, which are bordered above with white or gray. Females are similar in appearance, but have paler underparts and lack the black mask. Immature birds are similar in appearance to the adult female. First-year males have a faint black mask which darkens completely by spring" Wikipedia