Fairly common little bird of grassland and weedy areas in the tropical lowlands and foothills. Occurs from Texas to Panama. Often in flocks, mixing readily with other “weed-eating” small birds. Plumage is very variable, but all birds have a stubby dark bill with a curved culmen. Usually shows two whitish wingbars. Breeding plumage males with a black cap and bold white collar are usually outnumbered by female-plumaged birds, which are plain brownish, sometimes showing buffy wingbars.