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Dominating this era was Titanoboa, the undisputed largest snake in the history of the world. Most of the fossil record of ancient snakes is comprised of vertebrae like the one that launched the Titanoboa investigation.
(Hsiou and Albino, 2009; O'Shea, 2007). Green anacondas are the largest snakes in the world. There are records of 10 to 12 meter anacondas weighing up to 250 kg, though the actual maximal size of an anaconda is the subject of much dispute.