Rhabdophis helleri

Heller's red-necked keelback is a venomous keelback snake of the water snake subfamily, native to South Asia. It is a medium-sized snake that may reach 1.3m in total length, with 163 to 172 belly scales. Its type locality is Tengyueh, at 5,500 feet in Yunnan, China. It is oviparous (Wikipedia, general species account).

Its venom can cause severe coagulopathy, though no human fatalities have been reported. It is found in Bangladesh, Bhutan, China (Fujian, Guangdong, Guangxi, Guizhou, Hong Kong, Sichuan, Yunnan), India (Arunachal Pradesh, Assam, Mizoram, Sikkim, Tripura), Myanmar, Nepal and northern Vietnam. The sources opened give nothing on diet or habitat.