Burmese Pythons

BURMESE PYTHONS (Albino Burmese Python shown in pic)

Burmese Pythons are light-colored snakes with many brown blotches bordered in black down the back. The perceived attractiveness of their skin pattern contributes to their popularity with both reptile keepers and the leather industry. The pattern is similar in color, but different in actual pattern to the African Rock Python (Python sebae), sometimes resulting in confusion of the two species outside of their natural habitats.

In the wild, Burmese pythons grow to 3.7 meters (12 ft) on average,while specimens of more than 4.5 meters (15 ft) are uncommon.Individuals over 5 meters (16 ft) – like a specimen form Cooch Behar with 5.8 meters (19 ft) and 91 kilograms (201 lb)are very rare.There are reports of snakes more than 6 meters (20 ft) long, but those are often result of confusion between Burmese Pythons and Reticulated Pythons, stretched skins, or simple exaggeration. There are also dwarf forms on Java, Bali and Sulawesi. At Bali they reach an average length of 2 meters (6.6 ft) and on Sulawesi they achieve a maximum of 2.5 meters (8.2 ft).

Geographic Range and Habitat

The Burmese Python is found throughout Southern- and Southeast Asia including Eastern India, Nepal, Western Bhutan, Southeast Bangladesh, Myanmar, Thailand, Laos, Cambodia, Vietnam, Northern continental Malaysia, Southern China and in Indonesia on Java, Southern Sulawesi, Bali and Sumbawa.This python is an excellent swimmer and needs a permanent source of water. It can be found in grasslands, marshes, swamps, rocky foothills, woodlands, river valleys, and jungles with open clearings. They are good climbers and have prehensile tails.
Burmese Pythons as an invasive species

The captive breeding of Burmese Pythons in the Americas has led to some rather serious problems. People who grow tired of their pythons, or whose pythons have grown too large to be kept in their houses, have been known to release their pets into the wild rather than have them re-homed. This has been particularly problematic in Florida, where a large number of pythons have made their way to the Everglades.They have thrived there, begun to reproduce prolifically, and become an invasive species. Over 230 (National Geographic - October 28, 2005) have been captured in the Everglades where they are competing with alligators as the dominant predator. In recent years this competition has resulted in what officials describe as a draw.Since they have been known to eat endangered birds and alligators, these snakes present a new danger to an already fragile ecosystem. In February 2008, USGS scientists published a projected range map for the US, based on average climate data of the snake's home range and Global warming projections, which predicted that these snakes could eventually migrate to and flourish in as much as a third of the continental United States by the end of the 21st century. However, a subsequent study produced a map incorporating both climatic extremes and averages, which showed the Burmese python's range to be limited to Southern Florida.

Behaviour

Burmese Pythons are mainly nocturnal rain forest dwellers.When younger they are equally at home on the ground and in trees, but as they gain girth they tend to restrict most of their movements to the ground. They are also excellent swimmers, being able to stay submerged for up to half an hour. Burmese Pythons spend the majority of their time hidden in the underbrush. In the northern parts of its range it may brumate for some months during the cold season in a hollow tree, a hole in the riverbank or under rocks. Brumation is biologically distinct from hibernation. While the behavior has similar benefits, specifically to endure the winter without moving, it also involves preparation of both male and female reproductive organs for the upcoming breeding season.

Burmese Pythons breed in the early spring, with females laying clutches which average 12–36 eggs in March or April. She will remain with the eggs until they hatch, wrapping around them and twitching her muscles in such a way as to raise the ambient temperature around the eggs by several degrees. Once the hatch-lings use their egg tooth to cut their way out of their eggs, there is no further maternal care. The newly hatched will often remain inside their egg until they are ready to complete their first shedding of skin, after which they hunt for their first meal.

Diet

Like all snakes, Burmese Pythons are carnivorous. Their diet consists primarily of appropriately sized birds and mammals. The snake uses its sharp rearward-pointing teeth to seize its prey, then wraps its body around the prey at the same time contracting its muscles, killing the prey by constriction. They are often found near human habitations due to the presence of rats, mice and other vermin as a food source. However, their equal affinity for domesticated birds and mammals means that they are often treated as a pest. In captivity their diet consists primarily of commercially available, appropriately sized rats, and moving up to larger items such as rabbits and poultry as they grow. Exceptionally large pythons may even require larger food items such as pigs or goats, and are known to have attacked alligators in Florida, where it is an invasive species.

Digestion

The digestive response of Burmese Pythons to such large prey has made them a model species for digestive physiology. A fasting python will have a reduced stomach volume and acidity, reduced intestinal mass and a 'normal' heart volume. After ingesting prey, the entire digestive system undergoes a massive remodeling, with rapid hypertrophy of the intestines, production of stomach acid, and a 40% increase in mass of the ventricles of the heart in order to fuel the digestive process.

Conservation

Wild populations are considered to be "threatened" and are listed on Appendix II of CITES. All the giant pythons (including the Indian Python, the African Rock Python, and the Reticulated Python) have historically been slaughtered to supply the world leather market, as well as for folk medicines, and captured for the pet trade. Some are also killed for food, particularly in China.

In Hong Kong, it is a protected species under Wild Animals Protection Ordinance Cap 170.

In Captivity

Burmese Pythons are often sold as pets, and are made popular by their attractive color and apparently easy-going nature. However, these animals have a rapid growth rate, and will often exceed 2.1 meters (7 feet) in length in a year if cared for and fed properly. By age 4, they will have reached their adult size, though they continue growing very slowly throughout their lives, which may exceed 20 years.

While this species has a reputation for docility, they are very powerful animals, capable of inflicting severe bites or even killing a keeper by constriction. They also consume large amounts of food, and due to their size, require large, often custom-built, secure enclosures, which can be very expensive. As a result some are released to the wild by pet owners.

A secondary problem with feeding Burmese Pythons is that many owners believe if a snake acts hungry, that it should be fed. As Burmese Pythons are opportunistic feeders, they will eat almost any time food is offered, and often act hungry even when they have recently eaten. This often leads to overfeeding, and obesity related problems are common in captive Burmese Pythons.

Burmese Handling

Although pythons are typically afraid of people, due to their high stature (especially given that snakes are usually low to the ground), and will generally avoid people, special care is still required when handling them. A three meters long Burmese Python can easily kill a child and a five meters long (around 16.5 feet) Burmese Python is certainly capable of overpowering and killing a fully grown adult, so it is not advisable to handle such a large snake alone. If the snake does wrap around an individual, others should be present to unwind the snake, starting at the tail. Many reptile zoos demonstrate proper snake handling technique. Usually the demonstrator handles the head, while non-professionals can handle the rest of the snake's body. Snakes should be supported firmly but gently.

Variations

The Burmese Python is frequently captive bred for color, pattern, and more recently size. The albino form of the Burmese Python is especially popular and is the most widely available morph. They are white with patterns in butterscotch yellow and burnt orange. There are also "Labyrinth" specimens, which have maze like patterns, khaki colored "Green" Burmese Pythons, and "Granite" Burmese Pythons, which have many small angular spots. Breeders have recently begun working with an island lineage of Burmese Pythons. Early reports indicate that these "Dwarf" Burmese have a slightly different coloring and pattern than their mainland relatives and do not grow much over 2.1 meters (7 ft) long. The "Dwarf" Burmese were first captively reproduced by Beau Lewis of Arizona, USA. One of the most sought-after of these variations is the leucistic Burmese. This particular variety is very rare, and has only recently (2008/2009) been reproduced in captivity as the super form of the co-dominant hypomelanistic trait. This snake is entirely bright white with no pattern and black eyes, thus precluding it from being a true albino. The first Caramel Burmese Python was successfully hatched out on May 15, 2008 by Mark Andrews and Jason Hormann of Kansas City, KS. This snake has caramel colored pattern with milk chocolate eyes.

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