Boulenger's keelback (Xenochrophis asperrimus) also known as or Sri Lankan keelback is a non-venomous and common water snake endemic to Sri Lanka. It is found in both the dry and wet zones of the country. The distinctive features of this reptile is its short cylindrical body that is olive brown in colour, large black spots on the front of the body, its unusually long tail, dark head and the two black strips behind its eyes. Being nocturnal and diurnal, this reptile is seen frequenting fresh water bodies where it feeds mainly on fish, crustaceans, amphibians and small reptiles.
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