Rose-breasted grosbeaks are chubby birds with heavy bills that are a pale pinkish ivory. Adult male upperparts are black, with white wing patches and rump. Underparts are white, with a rose red breast and wing lining, and a black throat. In winter, a male grosbeak's feathers are mottled brown and white, with only a hint of rose. The female is brown above, with a broad white eyebrow and wing bars, and is heavily streaked below, with a yellow wing lining that is visible in flight. The song is a beautiful, rich, slurred series of whistles, much like a robin's carol, although much faster.