The Crab-Eating Mangrove Snake is a small homalopsid snake with a very variable colouration. The patterns and colours of individuals can range from muddy browns to dull greys to strong reds, orange and white. As its common name implies, this serpent is known for a diet that mainly consists of crustaceans such as crabs and lobsters. Most notably though, it is one of the very few snakes that does not swallow its prey whole; after having caught a crab, this snake will pull off the crab's limbs, eating each limb one by one, while the crab's main body is often left behind. this kind of behaviour is also known from another snake that also occurs in Thailand, namely Gerarda prevostiana.

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