The green tree python is characterized by a relatively slim body. The relatively long tail accounts for about 14% of the total length. The head is large and clearly defined from the neck. The muzzle is large and angular. The body is triangular in cross section with a visible spine. The species usually reaches a total length of 150-180 cm (4.9-5.9 ft), but large females may reach 200 cm (6.6 ft). The size also varies depending on the region of origin. The weight is highly dependent upon the nutritional status of the animal. Males can weigh about 1100-1400 g (2.4-3.1 lb), females up to 1,600 g (3.5 lb). Especially large specimens up to 2,200 g (4.9 lb) are females, which like most snakes are slightly larger and heavier than males.