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

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Jay O. Sanders