King Rat Snake

The king rat snake is one of the largest colubrids in East Asia, found across much of China, Taiwan, and into northern Southeast Asia. It is notable for being unusually large and heavy-bodied for a rat snake.

It is non-venomous, though it has a reputation for a bold, sometimes aggressive temperament when disturbed. Notably, this species is known to prey opportunistically on other snakes, including venomous species, making it ecologically significant in its range.

Its size and predatory habits have made it a well-documented species in East Asian herpetology.

The king rat snake has a dark olive to blackish body marked with irregular yellow crossbands or reticulations, which become more pronounced toward the head and neck.

• Strongly keeled dorsal scales, unusual among rat snakes
• Large, robust head clearly distinct from the neck
• Heavy-bodied build compared to most colubrids
• Round pupils
• Adults commonly reach 1.5-2.5 m and can be quite heavy

This species inhabits forests, agricultural land, rocky hillsides, and areas near human settlements across its range in China, Taiwan, and parts of northern Vietnam and Myanmar, from lowlands into hilly terrain.

The king rat snake is active by day and dusk and can be defensive, sometimes hissing loudly and striking when cornered. It is a powerful constrictor known to prey on rodents, birds, and notably other snakes, including venomous species.

It is oviparous, with females laying clutches of roughly 10 to 20 eggs in warmer months.