Black-headed Python

Adults of A. melanocephalus typically grow to 1.5–2 m (4.9–6.6 ft) in length (including tail), but can grow to a maximum length of 3.5 m (11 ft). The body is muscular with a flattened profile, while the tail tapers to a thin point. The top of the head is covered by large symmetrical scales. The dorsal scales, which are smooth and glossy, number 50-65 rows at midbody, while 315-355 ventral scales occur. The tail has 60-75 mainly single subcaudal scales and the anal scale is single. The posterior subcaudals tend to be divided, often irregularly. The color pattern consists of shades of black, dark grey, brown, gold, and cream arranged in a banded or brindled pattern. The belly is light-colored, flecked with darker spots. The head is shiny black that also extends down the neck and throat for several inches.

The species A. melanocephalus is found in Australia, in the northern half of the country, excluding the very arid regions. The type locality given is "Port Denison Bowen", Queensland, Australia. It occurs in humid tropical to semiarid conditions.

A. melanocephalus is terrestrial and is often found amongst rocks and loose debris. If disturbed, it hisses loudly, but is unlikely to bite unless hunting prey. It sometimes strikes with a closed mouth, but generally can be handled easily. It is a strong swimmer, but is almost never found in water. It is not venomous.

A. melanocephalus is mentioned in, or plays a central role in, the stories of the Indigenous Australians Dreamtime tradition.