The Green-tailed Warbler is a small bird found only on Hispaniola. It has a gray head and body, olive-green back and wings, and mainly eats insects.
Its head and body are gray, with olive-green back and wings. It has red irises and a split white eye-ring above and below each eye. It is 12–14 cm long.
Insects make up most of its diet.
It breeds in the mountains in May and June, and breeding may begin earlier in lowlands. It builds a cup-shaped nest and lays two to four eggs per clutch.
An extinction-risk assessment has not been added yet.