Adder – A venomous viper found in Eurasia. African Rock Python – A huge nonvenomous python found in Africa. Anaconda – Several very large boa species found in South America. Asian Vine Snake – Slender, innocuous snakes found in Asia. Black Mamba – An extremely dangerous, aggressive, and fast-moving African snake. Black Pine Snake – A mostly black snake found in the southeastern U.S. Boa Constrictor – Large, nonvenomous snakes commonly found as pets.