Theyellow warbler (Setophaga petechia) is a species of bird in theNew World warbler family, Parulidae. It is the most widespread species in the diverse genusSetophaga, breeding in almost the whole of North America, the Caribbean, as well as northern South America. It has 35 subspecies, residing in various different habitats. Depending on the subspecies, the yellow warbler may be between 10 and 18 centimetres (3.9 and 7.1 in) long, with a wingspan from 16 to 22 centimetres (6.3 to 8.7 in). It weighs 7 to 25 grams (0.2–0.9 oz). In winter, female and immature birds all have similarly greenish-yellow uppersides and are a duller yellow below, while males acquire breast and sometimes head coloration. This yellow warbler was photographed in theJamaica Bay Wildlife Refuge in New York City, United States.Photograph credit:Rhododendrites