Discovering the Yonaguni King Rat Snake (Elaphe carinata yonaguniensis) on Yonaguni Island,Japan

The King Rat Snake (Elaphe carinata) is a large colubrid snake found in Taiwan, Vietnam, China, and other regions. When threatened, it releases a liquid with a distinctive odor, which is why it is called “臭蛇” (Shūda, or “stinking snake”) in Japanese.

In Japan, it is found only on Yonaguni Island and is considered a unique subspecies known as the Yonaguni King Rat Snake (Elaphe carinata yonaguniensis) due to its pale coloration. This snake is one of the largest in Japan, reaching a maximum length of about 240 cm. It preys on frogs, mice, lizards, and even other snakes, earning it the English name “King Rat Snake.”

I observed these snakes in mid-October. With the low temperatures in the mornings and evenings, I was uncertain if I would see any, but they emerged along the paths around the rice fields at dusk. Continuing my herping, I encountered many individuals at various times, including early morning, evening, and night.

However, this species is not only very fast but also has a fierce temperament, making it difficult to approach with a macro lens. The only one that allowed me to photograph it slowly was a young juvenile.

Around 40cm length. Juvenile.

Traveling to Japan’s westernmost Yonaguni Island to see these snakes in their natural habitat was an unforgettable experience. The herping on Yonaguni Island was absolutely amazing.

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