The checkered keelback, Xenochrophis piscator, is one of the most commonly found water snakes in the Indian subcontinent. I call it "the serpentine mermaid" due to its aquatic habitat and a beautiful checkered pattern on its body personifying a mermaid. The word "keelback" describes rough scales in every keelback snake.

This snake appears to have a thick, round, and cylindrical body growing more slender toward the tail, with size varying from 140n to 175 cm in length. Checkered keelbacks have large eyes with round pupils, and a checkered pattern of glossy keeled scales can be seen on the upper body with rows of black, yellow, or moss-green checks alternating with white ones. Colours on the fore body can be seen in reddish, greenish, yellowish, brownish, and bluish shades, with white underside and two black streaks behind the eye.

These snakes are very aggressive and eager to bite when disturbed unexpectedly. A checkered keelback bite can be really painful because of its sharp pointed fangs, which help it to get a good grip on slippery fish and amphibians. I always prefer using a snake stick while handling a checkered keelback because I had a bad experience in the past being bitten by one, which was enormously painful with a deep scar.

These snakes prefer living in marshy water bodies like gutters, drainages, rivers, ponds, and lakes while staying on land at night. If threatened, it flattens its neck and strikes with mouth wide open. It is an oviparous snake laying 20-40 eggs in crevices near water. It was recorded that a female checkered keelback 150 cm long laid 110 eggs at the Pune Snake Park in Pune, Maharashta.

It's always fun handling a checkered keelback because of its active behavior, but the experience is scary, too!