Immatures are duller and have duskier face markings. They also have duskier heads and brighter rufous tails than do brown morph birds. The female is cinnamon-brown above, with a duskier tail, and bright cinnamon-rufous below. The later instars are darker and "duskier" than early instars. Southern populations have duskier buff breasts and distinctly smaller bills. Occasionally, the barring to the lower belly and flanks may appear duskier. Juveniles can be distinguished by duskier head markings, and cinnamon wingbars.