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Big as a Sub
Giant ichthyosaurs swim through waters that once covered much of North America. This species, Shonisaurus sikanniensis, may have been 75 feet (23 meters) in length, longer than a sperm whale. Its sleek shape and nostrils atop its snout like a blowhole conjure further comparisons to whales. A vertical tail fin, though, gave its back end more the look of a shark. QTVR by NGM Art, pandromeda.com