Small warbler, olive above with intense yellow throat. Adult males have black masks. Forages for insects, typically in shrubby, wet areas, including marshes, forest edges, and fallow fields. Often hides in thick vegetation. Listen for its ringing "witchity-witchity-witchity" song in spring and summer. Very short, rounded wings, which equates to it being a short-distance migrant: some winter in southern U.S.