Arrow snake is a common name for venomous snakes of the genus Thelotornis. The name refers to the shape of their head, which is triangular and reminds of the head of an arrow. Arrow snakes are native to Africa and are known for their potent venom and fast movements. These snakes are also sometimes called twig snakes because of their slender build and their tendency to hide in trees and bushes. Other synonyms for arrow snake include vine snakes, bush snakes, and tree snakes because of their arboreal habits. These snakes have evolved to be excellent climbers and are known for their agility and readiness to flee from danger.