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Mosasaurs were the largest aquatic lizards that ever evolved and attained lengths of almost 60 feet with a skull 6 foot long!  The mosasaur was a powerful swimmer who spent its entire life in the sea. Mosasaurs had long and powerful bodies whose tails and limbs were adapted for swimming.  They probably swam by moving their long body in a snake-like way, also using their finned tail to propel them forwards. They steered with small, webbed feet.