Bungarus andamanensis

The South Andaman krait is a venomous krait endemic to the Andaman Islands and Little Andaman Islands of India. It is a medium-sized snake, growing up to 1.3 m. The eyes are small and entirely black with round pupils, the back scales are smooth and in 15 rows with strongly enlarged scales along the spine, and the lips are yellowish (Wikipedia, general species account).

It is nocturnal and mainly active during and after rains. Juveniles are most often seen in June, suggesting a seasonal breeding pattern. It mainly preys on other snakes, including water snakes, and occasionally on fish.