Black-headed pythons along with the woma python belong to Aspidites, a genus endemic to Australia. "BHP's" are found across the top third of Australia in a broad range of habitats. In the wild, they spend considerable time in burrows and in captivity will dig their own holes if given a suitable substrate. They can grow quite quickly in captivity and will easily reach up to 2.5 metres in length with a girth the size of a man's upper arm.
There are few snakes more impressive than a large, healthy black-headed python. They vary considerably over their range, from the more subtly banded brown/gold animals of central Queensland, through the rarely seen spectacular chocolate and cream form from specific areas of coastal Northern Territory, to the smaller almost black and white animals that occur in the Pilbara in Western Australia.