The green anaconda is the largest snake in the world, in terms of sheer mass. Burmese pythons and reticulated pythons are both large species. The largest native snake to the United States is the indigo snake.
The fossilized "titanic boa from Cerrejon" was an estimated 12.8 meters. In 2009, researchers discovered fossils in northeastern Columbia that dwarf modern anacondas and pythons. Scientists have estimated the fossilized snake was almost 13 meters long, approximately double the length of the largest recorded present-day anaconda.
Burmese pythons are among the largest snakes on Earth, capable of reaching 7 meters or more in length and weighing up to 90 kilograms. Green anacondas can grow to more than 8.8 meters and weigh more than 227 kilograms. Female green anacondas are the larger of the two sexes. Reticulated pythons are the largest of the python family, and their length can exceed 10 meters.