Rhabdophis tigrinus, also known commonly as the tiger keelback,[2] yamakagashi, or kkotbaem, is a species of venomous snake in the subfamily Natricinae of the family Colubridae.

[2][4] The dorsal color pattern of R. tigrinus is olive-drab green, with black and bright orange crossbars or spots from the neck down the first third of the body.

[5] R. tigrinus is found in eastern Russia (Primorskiy and Khabarovsk territories), North and South Korea, China (widespread, except in the western third and the extreme south; Zhejiang, Fujian, Jiangxi, Hubei, Guizhou, Sichuan, Gansu, Shaanxi and Inner Mongolia), on the island of Taiwan, in Vietnam and in Japan (Yakushima, Tanegashima, Kyūshū, Shikoku, Honshu, Osaka and in the Ryukyu Islands).

[6] Rhabdophis tigrinus has specialized nuchal glands on the back of the neck [7] that are used to store cardiotonic steroids (bufadienolides) sequestered from the toads in their diet.

[10] Rhabdophis tigrinus has two rows of glands in its neck that provide protection from predators by releasing steroidal toxins that are sequestered from ingested poisonous toads, referred to as kleptotoxisism.