Ptyas carinata, commonly known as the keeled rat snake, also called King koros is a species of colubrid snake. It is found in Indonesia, Myanmar, Malaysia, Thailand, Philippines, Cambodia, Vietnam, Laos and Singapore. This little known species is probably the largest extant species in the diverse colubrid family that includes just over half of living snake species. Known adult lengths of snakes of this species in Taiwan measured anywhere from .Wang, C. & Wang, J.H.M. (1956). "The Reptiles of Taiwan". J. Taiwan Mus. 9. However, the reportedly maximum size was about .Das, I. (2015). A Field Guide to the Reptiles of South-East Asia. Bloomsbury Publishing. Males reportedly average slightly larger than females.Taub, A. M. (1967). "Comparative histological studies on Duvernoy's gland of colubrid snakes". Bulletin of the AMNH; v. 138, article 1. They are probably opportunistic predators on a variety of prey, such as rodents, though adult lizards are thought to be significant prey in Indonesia.
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Photo by Noel Thomas - MacRitchie North Central Catchment Nature Reserve, Singapore Photo by John Varigos - Mt Rimau, Sipitang - Malaysia Species of Doi Suthep-Pui National Park Ptyas carinata in Thailand