World's Longest Living Snake

Although it is generally accepted that the reticulated python is the world's longest living snake, most length estimates longer than 6.35 m (20 ft 10 in) have been called into question. The largest living snakes in the world, measured either by length or by weight, are various members of the boidae and pythonidae families. In terms of length, in addition to those listed here, there are two other species that may possibly reach a length of 20 feet (6.1 m) or more – the Oenpelli python 

(Morelia oenpelliensis) and the olive python (Liasis olivaceus) – however, the information available about those species is rather limited. They include anacondas, pythons, and boa constrictors, which are all non-venomous constrictors. The longest venomous snake, with a length up to 18.5–18.8 ft (5.6–5.7 m), is the king cobra, It has been suggested that confident length records for the largest snakes must be established from a dead body soon after death, or alternatively from a heavily sedated snake.