Today the largest snake in the world is the reticulated python, Python reticulatus which lives in Southeast Asia, and grows to a maximum of approximately 32 feet (10 meters) in length. The heaviest snake alive is Eunectes murinus, commonly known as the anaconda which normally grows to a maximum of about 20 feet (6 meters) in length, but sometimes develops as long as 25 feet (7.6 meters), and weighs around 100 pounds (45 kilograms). And, despite extensive searching, and even cash rewards of $50,000 offered by the Wildlife Conservation Society, no live snake longer than 30 feet (9.1 meters) has been found.
But, neither the reticulated python nor the anaconda can hold a candle in comparison to an ancient snake known as Titanoboa cerrejonensis. This giant snake lived in tropical rainforests that covered the region that is now the nation of Columbia. It inhabited this area during the Paleocene epoch, between about 60 million years ago and 58 million years ago. Concerning size, Titanoboa is thought to have grown to about 43 feet (15 meters) in length, would have had a diameter of more than 1 meter (3 ft ), and almost certainly weighed more than 1 ton.
Titanoboa, like most other big snakes, has been non-venomous. Titanoboa would lay motionless in wait until victim approached, and then suddenly and without warning, when the prey came within reach it would pounce, wrapping itself around its prey. Slowly and slowly, it would tighten its body around that of the victim, until the prey eventually suffocated to death.