Scientists from The Field Museum in Chicago have studied the remains of Whatcheeria - a six foot long lake dwelling creature that roamed Iowa 340 million years ago.
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Ancient Iowan superpredator became great by front-loading its growth in its youth miragenews.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from miragenews.com Daily Mail and Mail on Sunday newspapers.