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Dunkleosteus was an apex predator in the oceans of the Devonian period, about 400 million years ago. It could open its mouth in one-fiftieth of a second, creating a vacuum that sucked in its prey. It ate almost everything it encountered, including sharks, other members of its own species, and sea creatures with hard shells, which it regurgitated.

Written by Curiosity Staff May 13, 2015