Two-headed Sipo
Chironius bicarinatus
- Least concern
- Card rarity: Common
- Reptiles

Chironius bicarinatus, the two-headed sipo, is a species of snake in the family Colubridae. The species is found in Brazil, Argentina, Uruguay, and Paraguay.
Classification
- Class
- Reptilia
- Order
- Squamata
- Family
- Colubridae
- Genus
- Chironius