Morelia amethistina is a nonvenomous species of snake, known as the amethystine, scrub python, or sanca permata locally, found in Indonesia, Papua New Guinea, and Australia. Popular among reptile enthusiasts, and noted for its coloration and size, it is one of the six largest snakes in the world, as measured either by length or weight, and is the largest native snake in Australia and Papua New Guinea. Currently, four subspecies of the nominate race, M. a. amethystina, are generally recognized. The Mollucan Islands, including Halmahera, Ternate, and Tidore, are home to M. a. tracyei. The Tanimbar Islands are home to a smaller subspecies, M. a. nauta. On the island of Seram, M. a. clastolepis can be found, and mainland PNG (including the Indonesian western half, once called Irian Jaya—now West Papua) and many of its near offshore islands, M. a. amethystina is quite common. In Australia, M. a. kinghorni is represented.
Specimens have reportedly been measured at more than 8.5 m (27.9 ft) in total length, but this is exceptional, as 5 m (16.4 ft) specimens are already considered large. As is typical for very large constricting snakes, almost no verified specimens of this species have exceeded 6 m (19.7 ft). However, in 1990, while conducting a herpetological survey, Tom Mendelson collected a wild female specimen on Biak Island, far Eastern Indonesia, which measured 22 feet 7 inches. Another huge female, in a report considered reliable by the staff of the Guinness Book of World Records, was measured by S. Dean in 1954 as 7.2 m (23.6 ft). A typical adult specimen will measure around 2 to 4 m (6.6 to 13.1 ft). Females typically weigh around 15 kg (33 lb). Some exceptional specimens have been confirmed to weigh over 30 kg (66 lb) and unconfirmed outsized specimens have been reported to scale 90 kg (200 lb), although no specimen of this enormous size has been authenticated. Males are much smaller and slimmer, averaging at 5.1 kg (11 lb) at maturity, and occasionally weighing upwards of 11 kg (24 lb). The body is relatively slim, unlike those of many other large members of this family.
The smooth dorsal scales are arranged in 39–53 rows at midbody. Deep pits are on six or seven of the posterior lower labials.
These snakes are found in Indonesia (Maluku Islands, Timur Laut Islands, Banda, Kai Islands, Aru Islands, Misool, Salawati, most of Western New Guinea, many islands in Geelvink Bay, such as Biak, Numfor, Yapen, and Supiori), Papua New Guinea (including Umboi Island, Bismarck Archipelago, Trobriand Islands, the d'Entrecasteaux Islands to Rossel Island, Louisiade Archipelago), and Australia (on some islands in the Torres Strait, the northern Cape York Peninsula south including the Atherton Tableland, and the eastern foothills of the Great Dividing Range). The type locality is unknown.
In northern Australia and New Guinea, it mostly lives in scrublands.
Their diet generally consists of birds, bats, rats, possums, and other small mammals. Larger Australian and Papuan specimens catch and eat wallabies, and cuscus, waiting by creek and river banks for prey seeking drinking water.
According to McDiarmid et al. (1999), all cases in which the specific name was spelled with a y follow Daudin's (1803) Python amethystinus and are therefore unjustified emendations.
M. amethistina from the Bronx Zoo in New York City
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