 Newborns measure 17–22 cm (6.7-8.7 inches) in total length.In Ashe's original 1968 description, adults were reported to grow to an average 49–68 cm (about 19-27 inches) total length, with a head and body length of 43–59 cm (about 17-23 inches) and a tail length of 6–9 cm (2.4-3.5 inches).The eyes are set well forward in the head and are surrounded by 14–17 scales.