English name: Yellow-bellied Water Snake (aka: “Plumbeous Water Snake” or “Rice Paddy Snake”)
Scientific name: Enhydris plumbea
Thai name: Ngu Pling
Description: To 77cm long. This small water snake has a fairly broad head and smooth scales. It is uniformly dark above with a pale cream to yellow underbelly.
Similar Species: Rainbow Water Snake has a smaller head and colored lines going down its body.
Jagor’s Water Snake has small dark blotches down its sides.
Chanard’s Mud Snake has a yellow line down its side and a row of small dark dots above the line.
Sunbeam Snake is iridescent, has a narrow wedge-shaped head, and is whitish-gray on the bottom.
Red-tailed Pipe Snake has a small head and a barred underbelly.
Yellow-striped Caecilian lacks scales, has stripes rather than a yellow belly, and has a distinctly non-snake-like head.
Habitat: Slow-moving rivers, ponds, swamps, rice paddies, and other wetland habitats with stagnant water. Forages from dusk until dawn. Found on land more often than other water snakes, but rarely very far from the water.
Contribution to the ecosystem: Helps control fish and frog populations. Provides food for larger snakes, large fish, monitors, and wading birds.
Danger to humans: The Yellow-bellied Water Snake will aggressively strike when cornered on land, but its small size keeps it from being able to inflict much damage. While it is a rear-fanged snake with some venom, the venom has a limited effect on humans, possibly leading to some swelling in the worst cases.
Conservation status and threats: No known conservation issues. This is a very common species in Thailand, though its population in Taiwan is considered endangered.
Interesting facts: Yellow-bellied Water Snakes are excellent swimmers but move awkwardly on land. When faced with a threat on land, they will sometimes flip their bodies into the air and backwards with a reverse-striking motion, propelling themselves erratically towards the water.
Snakes of Taiwan: Enhydris plumbea
Reptiles of Hong Kong: Enhydris plumbea
The IUCN Red List: Enhydris plumbea
Thailand Office of Environmental Planning and Policy: A Checklist of Amphibians and Reptiles in Thailand
A Photographic Guide to Snakes and Other Reptiles of Peninsular Malaysia, Singapore and Thailand
A Field Guide to the Reptiles of South-East Asia
A Field Guide to the Snakes of South Vietnam