About 75 million years ago, a mosasaur — a dolphin-like, predatory, marine reptile that lived during the dinosaur age — bit another mosasaur so hard that it left its tooth behind, embedded in its foe's face, new research finds. Now, paleontologists are studying the remains of the victim, a creature that sustained not one, but two attacks on its face, likely from different adversaries, said paleontologist Takuya Konishi, an assistant professor at the University of Cincinnati. "The specimen represents the first direct, unequivocal evidence of nonlethal biting, and not predation, between mosasaurs," Konishi told Live Science, here at the 76th annual meeting of the Society of Vertebrate Paleontology.
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