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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.
As an added bonus, anacondasâlike crocodilesâalso have eyes and nostrils designed to poke above a riverâs surface. No wonder the stealthy, semi-aquatic predators are occasionally called âwater boas.â 3. The Green Anaconda is the Heaviest Known Snake, but Not the Longest. Python, via iStock Thanks to their muscular physique, the green anaconda is earthâs most massive serpent while Asiaâs slightly-longer reticulated python (Python reticulatus), though leaner, is the lengthiest.