Boiga kraepelini, commonly known as the square-headed cat snake, Kelung cat snake, or Taiwanese tree snake, is a mildly venomous species of rear-fanged snake in the family Colubridae. The species is native to East Asia and Southeast Asia (Taiwan, China, Vietnam, and Laos). Its specific name, kraepelini, honours Karl Kraepelin, a German naturalist. The common name, Kelung cat snake, refers to its type locality, Keelung in northern Taiwan.

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