morelet's seedeater Sporophila morelleti

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.