About 60% of Big John's skeletal remains were discovered. Here, you can see the Triceratops ' entire skeleton after the restoration work was complete.
A violent encounter with a rival dinosaur may explain why Big John, the most massive Triceratops skeleton ever found, has a keyhole-shaped opening on its frill, a new study finds. This fight happened more than 66 million years ago, but scientists think they know the assailant's identity: It was likely another…
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