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The Indochinese (or Gray) Rat Snake (Ptyas korros) has a wide distribution extending from India across southeast Asia and southeastern China (including Taiwan, Hainan and Hong Kong) to Bali and has also been recorded (in 1917 and again in 1996) from Indonesian Borneo (Auliya 2002; Zheng et al. 2014).
In Thailand, P. korros occurs up to 3000 m, frequenting forests and agricultural areas. In Java, it has been recorded up to 700 m and is reportedly closely associated with rice fields. During the day, these snakes feeds opportunistically on a wide variety of vertebrates, including frogs, lizards, snakes, birds, mice, and (in the vicinity of human settlements) rats (including Rattus tanezumi [Asian House Rat] and R. tiomanicus [Malayan Wood Rat] ), These snakes, which are semi-aquatic and swim well, apparently feed more on frogs than on rodents (Auliya 2002 and references therein)
Lin et al. (2012) studied geographic variation in several female reproductive traits. Egg-laying date was latest for the most northern of three populations studied and earliest for the most southern population. Most of the other traits examined differed among the populations, but no trait (clutch size, clutch mass, egg shape, variability in egg sizes and relative clutch mass) that differed among populations varied in a geographical trend as did egg-laying date.
Ptyas korros is oviparous. Oviparous reptiles commonly provision their eggs with sufficient resources that hatchlings can still be nourished by post-hatching yolk after hatching. Ji and Sun (2000) studied the conversion of nutrients and energy in eggs and young hatchlings of P. korros.
Zheng et al. (2014) developed microsatellite markers with an eye toward studying gene flow, population structure and evolutionary history of P. korros