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Liopleurodon is an extinct genus of large pliosaurid the lived in the Middle to Late Jurassic period in the seas that covered Europe. Initially believed to reach maximum lengths of 12 meters (40 feet), fossilized tooth marks believed to have come from Liopleurodon at the time suggested it could reach sizes of 25 meters (82 feet), longer than many modern day whales. Current estimates place Liopleurodon at a much smaller 7.6 meters (25 feet). It was an apex predator during the middle and late Jurassic. Studies of the skull have shown that it could probably scan the water with its nostrils to ascertain the source of certain smells.
