Dr. Jonathan Bloch

In the pantheon of predators, it's one of the greatest discoveries since the T-Rex: a snake 48 feet long, weighing in at 2,500 pounds. Uncovered from a treasure trove of fossils in a Colombian coal mine, this serpent is revealing a lost world of giant creatures. Travel back to the period following the extinction of dinosaurs and encounter this monster predator.

A mining operation in Cerrejon, Northern Colombia revealed a treasure trove of fossils from animals that lived ten million years after the KT extinction that killed the dinosaurs. Surprisingly, enormous reptiles were dominate. Scientists investigate who was the apex predator of the era - Titanoboa, a quarter ton giant snake five times bigger than the largest anaconda, or a similarly giant crocodilian with an incredibly deadly bite force. —David Foss