Shockingly bright warbler of swamps and wet forest. Adult males have gorgeous yellow head and body with greenish back and blue-gray wings. Females and immature are slightly duller but still distinctive. Breeds in wet deciduous forests, primarily in the southeastern U.S. Winters to northern South America, where still has an affinity for wet forests, including mangroves. Typically stays in the understory, but males can perch up high when singing. Listen for loud, piercing series of 6-10 “tsweet” notes. One of only two warblers that nests in cavities.