The White-lipped Tree Viper, also called just White-lipped Viper, is a pit viper native to tropical forest of South and Southeast Asia. Its green colour provides good camouflage in the trees.

Its fangs inject venom which stops blood from clotting after being bitten by the snake. Prey is small birds and mammals. Males grow to some 23 inches (60cm) long and females some 32 (80cm).

The Large-eyed Pit Viper, also unhelpfully called the Green Pit Viper (a name applied to several others including the White-lipped above), is a pit viper native to forests of Thailand and Indochina. "Pit vipers" have a heat-sensing "pit" between the eye and nostril to detect warm-bodied prey. Its green colour provides good camouflage in the trees.