The stegosaurus, a giant dinosaur that grew to more than 18 feet long and was armed with enormous bony plates on its neck, back, and tail, has a brain that weighed only 2 onces and was no bigger than a walnut.Related Facts:A giraffe's neck can measure up to 6 feet (1.8 m) longUnlike most fish, seahorses are covered in bony…The chinese Giant Salamander can grow to be 6 feet…