Chrysopelea ornata:-flying snake or golden tree snake

Chrysopelea ornata is a colubrid snake found in South and Southeast Asia. It is, along with the other species in its genus Chrysopelea, very unusual in that it is capable of a type of gliding flight. It is also rear-fanged. Currently, three subspecies are recognized, including the typical form described here. The snake's striking looks and capability of gliding make it a popular choice for captivity.

Description

Chrysopelea ornata is usually green in color, with black cross-hatching and yellow or gold colored accents. The body, though slender, is far less so than in other tree snakes. It has a flattened head with constricted neck, a blunt nose and large eyes with round pupils.[1]

The lateral, sharp and pronounced keeled condition of the ventrals in association with the normal, not enlarged, vertebral row of scales distinguish this snake. The snakes rarely exceed 40 inches in length, the smallest being measured at 115mm[4] and the largest being 1,360 mm (4 ft 51/2 in) long. The tail is about one-fourth of the total length.[1]

Chrysopelea ornata has two major colour forms, which are largely determined by geographic locality, and their descriptions are given below:[1]

    In Sri Lanka and southern extent of its Indian range, the snake is primarily greenish yellow or pale green. Each scale has a black mesial streak or spot, and is more or less edged with black. The snake also has dark crossbars at intervals. A series of large, flower-shaped, reddish or orange vertebral spots may be present or absent. Ventrals greenish, outside the keel edged with black or spotted. Head black with vellow crossbars and spots. The flower-shaped spots are commoner in Sri Lanka than in south India.

    The second colour variety occurs Southeast Asia lacks the reddish vertebral spots, and has less prominent black crossbars.

Venom
This species is considered mildly venomous, with no confirmed cases of medically significant envenomation.

Red-spotted form of Chrysopelea ornata from North Bengal, India

Geographic range

India, Sri Lanka, Myanmar, Thailand, western Malaysia, Laos, Cambodia, Vietnam, China (Hong Kong, Hainan, Yunnan), Indonesia (Sumatra, Java, Borneo, Sulawesi), and the Philippines.

In India Chrysopelea ornata ranges from the Western Ghats, up to the Dangs, Katernia Ghat in Uttar Pradesh, North Bihar, northern West Bengal[1] eastwards to Arunachal Pradesh.[6] It is also found in the forests of the Andaman islands.[1]

Chrysopelea ornata climbing up prior to launching itself into the air

Behaviour

Chrysopelea ornata is diurnal and arboreal. The snake's gliding ability, while not as impressive as that of the paradise flying snake (C. paradisi), still makes it capable of moving from tree to tree with relative ease. These snakes are excellent climbers, being able move across even the smallest of branches and even straight up trees with few branches by using the edges of rough bark. They are frequently seen moving up a coconut palm, or up vertical rock faces in graceful curves, gripping the somewhat uneven surfaces with their scales. They tend to be nervous, fast-moving snakes, and will attempt to flee if disturbed, but will not generally hesitate to bite if handled. They are mildly venomous, but the venom is not considered to be dangerous to humans.[4] It is intended to assist in subduing fast moving, arboreal prey. C. ornata takes small arboreal prey, such as lizards, bats and small rodents.[7] It might also feed on bird eggs and insects. Also it is reported to take snakes occasionally, and to avoid frogs, though frogs are also reported being eaten. The snake stalks or pursues the prey and seizes it by the neck, which is duly crushed in its strong jaws.[4]

Flight
Chrysopelea ornata, like others of its genus, glides or parachutes. This is presumably done to cover distances faster, to escape predators, to catch prey, or to move around in forests. Flying snakes usually parachute from tree to tree, but sometimes launch themselves from trees onto the ground. They have been known to cross as much as 100m.[5]

It does this by climbing up to a height, which it does easily by virtue of its keeled belly scales, and then launching itself into mid-air. The snake contracts its ventral surface inwards to form a U-shaped concave depression along the entire length of their bodies, holding the outer edges of the ventral scales rigid. This concave surface acts like a parachute, and increases air resistance, allowing the snake to glide forward with the thrust of its launch. The snake undulates through the air, in a swimming-like motion. It holds the tail rigidly upwards, and by twisting the tail from side to side, it attains balance. This motion allows it to propel forward, landing clumsily at the end of its flight.[5]

Head of C. ornata with brilliantly coloured tongue exposed

Reproduction
Breeding habits are little known. The snake is oviparous[6] and six to twelve elongated eggs[1] are laid. Gravid females have been obtained in May and June and hatchlings in June. In Bangkok, according to Smith, mating takes place in June. Hatchlings measure 114–152 mm (4 1/2 to 6 in) in length, while the smallest gravid female recorded was 1,093 mm (3 ft 7 in) in length.[1]