Graveyard of the giant beasts

Summary/Review: A mining operation in Colombia opened a window into an unknown period of the Earth's history where a world with giant creatures emerged. The biggest of them all was Titanoboa, a 43-foot snake, the largest that ever lived. New discoveries suggest that Titanoboa's rule was challenged by a giant crocodilian. Experiments reveal unmatched hunting prowess. So which one was the apex predator 58 million years ago?