Amethystine Python: 27 feet long, one of the world’s largest snakes by length, weight, and largest native snake in Papua New Guinea. Black Mamba: 14 feet long, the second-longest venomous snake ...

7 of world's largest and deadliest reptilesBlack mamba: It is the second-longest venomous snake after the king cobra that can commonly grow to 3 m (9.8 ft).