Chironius flavolineatus, also known as Boettger's sipo, is a vine snake species in the family Colubridae, endemic to savannas and semiarboreal biomes in Brazil, and much of South America. It is listed as least concern on the IUCN Red List since 2014. It is a member of the Genus Chironius which is composed of twenty-two other described snake species. It is nonvenomous, using camouflage or burrowing as a form of defense.

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