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Size : up to 1.5 m

The Sumatran pit viper is a rare viper species that is limited to Peninsular Malaysia, Sumatra and Borneo in Southeast Asia. This very large and magnificent viper species is green in colouration with a series of black bands across the body. The scales throughout the body have thick black borders, giving the appearance of an intricate network of green spots. There is a white ventrolateral stripe and the ventrals greenish white while the tail is reddish brown. The irises are copper in adults and whitish in juveniles.

The ecology of this rare pit viper species is poorly-known but it is regarded to be highly dangerous due to its large size, which should correspond with the amount of venom it could possibly inject in a single bite. The fangs are also remarkably long, measuring around an inch in large adults. It is believed to feed on birds and small mammals in the wild, as a captive specimen (now deceased) fed on laboratory mice.