Instructions
Look for white crescents or "eyebrows." Male robins have very pronounced white crescents around their eyes that contrast with their almost-black heads. Females also have white markings around their eyes. Immature robins' white eye markings are much paler. Similar birds don't have this white around their eyes, although the varied thrush has an orange stripe above and behind the eye.
Look at the beak. Robins have yellow beaks with black tips. The varied thrush has a brown-black bill with a straw-yellowish section at the base of the mandible.
Look at the throat. Robins have a white throat (just under the bill and above the warm orange chest) that is streaked with black spots. Other birds do not have this white section; the varied thrush has a black collar on an otherwise rusty-colored chest and throat, the eastern towhee has a black head and throat with a white body and rusty-colored sections on the sides of the belly, and the spotted towhee resembles the eastern towhee but has white spots and streaks on its wings.