Ptyas korros (Schlegel, 1837)
Indo-Chinese Rat Snake 灰鼠蛇

Ptyas korros
Squamata 有鱗目
Serpentes 蛇亞目
Family Colubridae 游蛇科
Genus Ptyas 鼠蛇屬
Species Ptyas korros
Other name -
Chinese name 過樹龍, 過樹榕
Total length Average 120 - 150 cm, can reach 180 cm.
Description Back Olive-brown or brown with dark longitudinal brown line across each scale, appear like thin brown stripes along entire body.
Juveniles olive brown, with white dots forming transverse crossbands on anterior part of body. The bands disappear in adults.
Ventrals and chin scales yellowish white. Tail long and whip-like. Scales smooth.

Found in open habitat such as grassy banks of streams and reservoirs, edges of cultivated fields and ponds, dry shrubland and woodland.
Rare in mountain grassland and dense forest.

Behaviour Diurnal.
Often hunts Gunther's frogs (Rana guentheri) in the tall grass around reservoirs, streams and catchwaters.
If surprised near water, will usually dive and swimming away with its head up.
When caught, will constantly thrash about and twist the body, making it extremely difficult to hold.
Will also bite vigorously. Does not become tame in captivity, but accepts food readily.
Captive specimens remain nervous, darting about, striking and biting when approached.
Commonly sold in snake shops for its gall bladder and meat.
Diet Feeds largely on frogs, but also on rodents and lizards.
Reproduction Lays 6 to 11 eggs, which hatch in about 45 days. Hatchling about 25 cm long.

Common throughout Hong Kong including many islands.
Ranges from East India to central and southern China including Taiwan, and south through Malay Peninsula to Indonesia.

Conservation Status IUCN Redlist: NE (Not Evaluated)
China Redlist: Endangered
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