Nature and Wildlife Photography
Videos → Reticulated Python
Khao Yai National Park, Thailand
January 11, 2011
Description P. reticulatus
Adults can grow to a length of more than 28.5 feet (8.7 m) and are the world's longest snakes. However, they are relatively slim for their length and are certainly not the most heavily built. The species Eunectes murinus, the green anaconda, may be larger. The largest individual ever accurately measured was Colossus, kept at the Pittsburgh Zoo during the 1950s, with a peak length of 28.5 feet. Numerous reports have been made of larger snakes, but since none of these have been measured by a scientist nor have the specimens been deposited at a museum, they must be regarded as unproven and probably erroneous. In spite of a standing offer of $50,000 for a live, healthy snake over 30 feet long by the New York Zoological Society, no attempt to claim this reward has ever been made.Skull diagram
The color pattern is a complex geometric pattern that incorporates different colors. The back typically has a series of irregular diamond shapes which are flanked by smaller markings with light centers. In this species' wide range, much variation of size, color, and markings commonly occurs.
In zoo exhibits the color pattern may seem garish, but in a shadowy jungle environment amid fallen leaves and debris it allows them to virtually disappear. Called a disruptive coloration, it protects them from predators and helps them to catch their prey.Geographic range
Found in Southeast Asia from the Nicobar Islands, Bangladesh, Burma, Thailand, Laos, Cambodia, Vietnam, Malaysia and Singapore, east through Indonesia and the Indo-Australian Archipelago (Sumatra, the Mentawai Islands, the Natuna Islands, Borneo, Sulawesi, Java, Lombok, Sumbawa, Sumba, Flores, Timor, Maluku, Tanimbar Islands) and the Philippines (Basilan, Bohol, Cebu, Leyte, Luzon, Mindanao, Mindoro, Negros, Palawan, Panay, Polillo, Samar, Tawi-Tawi). The original description does not include a type locality. Restricted to "Java" by Brongersma (1972).
Three sub-species have been proposed, but are not recognized by ITIS. The color and size can vary a great deal between the sub-species described. Geographical location is a good key to establishing the sub-species, each one has a distinct geographical range.Habitat
The python lives in rain forests, woodland and nearby grassland. It is also associated with rivers and is found in areas with nearby streams and lakes. An excellent swimmer, it has even been reported far out at sea and has consequently colonized many small islands within its range. During the early years of the twentieth century it is said to have been common even in busy parts of Bangkok, sometimes eating domestic animals.Feeding
Their natural diet includes mammals and occasionally birds. Small specimens"?up to 3"?4 meters (10"?14 ft) long"?eat mainly rodents such as rats, whereas larger individuals switch to prey such as Viverridae (e.g. civets and binturongs), and even primates and pigs. Near human habitation, they are known to snatch stray chickens, cats and dogs on occasion. Among the largest, fully documented prey items to have been taken are a half-starved Sun Bear of 23 kilograms that was eaten by a 6.95 m (23 ft) specimen and took some ten weeks to digest, as well as pigs of more than 60 kg (132 lb). As a rule of thumb, these snakes seem able to swallow prey up to ¼ their own length, and up to their own weight. As with all pythons, they are ambush hunters, waiting until prey wanders within strike range before seizing it in their coils and killing via constriction.Danger to humans
Attacks on humans are rare, but this species has been responsible for several human fatalities, in both the wild and captivity. They are among the few snakes that have been fairly reliably reported to eat people, although only a few cases of the snake actually eating (rather than just killing a human) appear to be authenticated:
Considering the known maximum prey size, it is technically possible for a full-grown specimen to open its jaws wide enough to swallow a human child, teenager, or even an adult, although the flaring shoulders of Homo sapiens could pose a problem for a snake with not enough size (<6 meters). The victim would almost certainly be dead by the time the snake started swallowing. At least in the 1998 incident, the victim was gathering food or wood in the forest when he happened upon the snake. In any case, a snake reaching more than 5 meters in length would be able to kill and eat a human being.Reproduction
Oviparous, females lay between 15 and 80 eggs per clutch. At an optimum incubation temperature of 31"?32°C (88"?90 °F), the eggs take an average of 88 days to hatch. Hatchlings are at least 2 feet (61 cm) in length.Captivity
Increased popularity in the pet trade is due largely to increased efforts in captive breeding and selectively bred mutations such as the "albino" and "tiger" strains. They can make good captives, but keepers should have previous experience with such large constrictors to ensure safety to both animal and keeper. Although their interactivity and beauty draws much attention, some feel they are unpredictable. They do not attack humans by nature, but will bite and possibly constrict if they feel threatened, or mistake a hand for food. While not venomous, large pythons can inflict serious injuries, sometimes requiring stitches.
The huge size and attractive pattern of these snakes has made them favorite zoo exhibits, with several individuals claimed to be above 20 feet in length and more than one claimed to be the largest in captivity. However, due to their huge size, immense strength, aggressive disposition, and the mobility of the skin relative to the body, it is very difficult to get exact length measurements on a living reticulated python, and weights are rarely indicative, as captive pythons are often obese. Claims made by zoos and animal parks are sometimes exaggerated, such as the claimed 49-foot snake in Indonesia which was subsequently proven to be less than 22 feet. For this reason, scientists do not accept the validity of length measurements unless performed on a dead or anaesthetized snake which is later preserved in a museum collection.Taxonomy
Three subspecies may be encountered, including two new ones:
The latter two are dwarf subspecies. Apparently, the population of the Sangir Islands north of Sulawesi represents another such subspecies, but it is not yet formally described.
The proposed subspecies dalegibbonsi, euanedwardsi, haydnmacphiei, neilsonnemani, patrickcouperi and stuartbigmorei but have not found general acceptance.
A recent phylogenetic study of pythons suggested that the reticulated python as well as the Timor python are more closely related to Australasian pythons than other members of the genus Python, and should therefore be placed in a separate genus, Broghammerus. This is, however, highly controversial as Raymond Hoser was the first to suggest the genus Broghammerus, and most herpetologists question his authenticity.See also
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