Green Keelback

The green keelback, or lead keelback, is a non-venomous colubrid native to parts of the Indian subcontinent. It is stout and viper-like in build and about 2 feet (61 cm) long including the tail when fully grown. The dorsal scales are strongly keeled. Adults are dull green above, uniform or with traces of black markings, and the belly is whitish, yellow or lead-coloured (Wikipedia, general species account).

Young snakes show an inverted black V-mark on the neck with bright yellow or orange between it and a smaller second mark, and a black stripe from the eye to the angle of the mouth. Nationally Near Threatened (Sri Lanka National Red List 2012, listed as Macropisthodon plumbicolor).