BEST SCIENCE PHOTOS OF THE WEEK XXI
A newfound giant turtle that lived 60 million years ago in what is now northwestern South America would have been more than a mouthful for a neighbouring predator, the world's largest snake Titanoboa.
The turtle's huge carapace, or shell, was nearly circular, like a tire, the researchers said.
[Full Story: Giant, Round Prehistoric Turtle Discovered]
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