Ptyas carinata, commonly known as the keeled rat snake, is a species of colubrid snake. It is found in Indonesia, Myanmar, Malaysia, Thailand, Philippines, Cambodia,India, Vietnam 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 . However, the reportedly maximum size was about . Males reportedly average slightly larger than females. They are probably opportunistic predators on a variety of prey, such as rodents, though adult lizards are thought to be significant prey in Indonesia. References External links 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 Colubrids Reptiles of Thailand Reptiles of Indonesia Reptiles of Malaysia Reptiles of the Philippines Reptiles of Cambodia Reptiles of Vietnam Reptiles of Myanmar Taxa named by Albert Günther Reptiles described in 1858 Snakes of Vietnam Snakes of Asia Taxobox binomials not recognized by IUCN Reptiles of Borneo