Bloodsucking plant from the mountains. Leeches blood from its prey. Weak against fire.
Chupacabra are weak against fire. Use that against them to save yourself the trouble of hitting them only to have the leach HP from you and undo all your hard work. If you encounter multiple Chupacabra, and have no fire, only target one at a time or you will find yourself hopelessly going no where.