The average size is about 1m (39.3 inches) in total length (body + tail) and very stout. Large specimens of 190 cm (75 in) total length, weighing over 6.0 kg (13.2 lbs) and with a girth of 40 cm (16 in) have been reported. Specimens from Saudi Arabia are not as large, usually no more than in total length. Males are usually larger than females and have relatively longer tails.