Titanoboa is an extinct genus of very large snakes that lived in what is now La Guajira in northeastern Colombia – they could grow up to 12.8 m (42 ft) long and reach a weight of 1,135 kg (2,500 lb).
Fossils of Titanoboa have been found in the Cerrejón Formation and date back around 58 to 60 million years ago. The giant snake lived during the Middle to Late Paleocene epoch, a 10-million-year period immediately following the Cretaceous-Paleogene extinction event. The only known species is Titanoboa cerrejonensis, the largest snake ever discovered, which supplanted the previous record holder, Gigantophis.
Now that you know a bit about the snake, let's get to what life would be like now if the snake still existed. It would only be able to survive in rainforests with warmer climates near the equator, which is bad news for any central and South Americans that lived anywhere nearby.
This also means that the indigenous people who may have lived in the forest with the snake would likely not have the same history they do now, mainly because they probably wouldn't survive living in the same habitat as the huge snake.