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Lycodon irwini
Habitat
Moist evergreen forest
Range
Great Nicobar Island only
Size
Average 71–84cm; up to 119cm
Irwin's wolf snake is a colubrid native to the Nicobar Islands of India. It averages about 71 to 84 cm in length, in rare cases up to 119 cm. The body is slender, with a long tail tapering gradually to a whitish end scale, and the head is oblong and slightly flattened. The average tail length is 16 to 18 cm (Wikipedia, general species account).
It favours moist evergreen forests and is known only from Great Nicobar Island, suggesting that it may be endemic to the island.