Eastern racers are nonvenomous snakes endemic to North America and Central America. The patterns of these snakes vary widely among subspecies. Most are solid-coloured as their common names imply: black racers, brown racers, tan racers, blue racers or green racers. All subspecies have a lighter-coloured underbelly: white, light tan or yellow in colour. Juveniles are more strikingly patterned, with a middorsal row of dark blotches on a light ground colour. The tail is unpatterned. As they grow older, the dorsum darkens and the juvenile pattern gradually disappears.