Spinosaurus

The TRex pales in comparison to the massive but lesserknown Spinosaurus. Reaching up to 59 feet (18 m) long, this prehistoric beast could weigh more than a semitruck and the webbed spines on its back could have easily reached the height of a basketball player. Spinosauruss alligatorlike mouth likely means it was a major fish eater and spent much time in the water. Makes us wonder whether those back spines could have been used for swimming.