The giant prehistoric snake that reached about 13 metres and lived in Colombia was Titanoboa. Its fossils were discovered in the Cerrejón coal mines of northeastern Colombia and described as Titanoboa cerrejonensis in 2009.
Titanoboa lived during the Paleocene, around 60–58 million years ago, shortly after the non-avian dinosaurs disappeared. It belonged to Boidae, the family that includes boas and anacondas. Although it resembled an enormous constrictor, researchers think it was at least partly aquatic and may have hunted fish in the warm tropical waterways of ancient northern South America.
Length estimates based on vertebrae originally placed Titanoboa at about 12.8 metres, with later skull-based estimates suggesting some individuals may have reached roughly 14 metres. Its estimated mass was around a tonne or more, far exceeding that of most living snakes. The related name “anaconda” is a common mix-up: anacondas are modern snakes, while Titanoboa was an extinct genus known only from fossils.