Stegosaurus was a large armored plant-eating dinosaur that lived during the Upper Jurassic Period (155-150 million years ago) in what is now western North America. It had an unusually small head, and although an adult would have weighed over 4.5 metric tons, its brain would have weighed less than three ounces. This led to the suggestion thatStegosaurus was extremely dull-witted, but it was clearly a successful dinosaur, so its small brain obviously wasn’t a problem.
Characteristics: Stegosaurus has extremely short front limbs that gives it a very rounded back and places its small head very close to the ground. Because of this, it is thought that it would have been restricted to feeding at or near ground level. Stegosaurus has two sets of long bony spikes on the tail that probably functioned in defense against predators, and a double row of plates along its back.
Historically, Arabian Foals were the result of intense, selective breeding by their Bedouin masters, who were quite particular about which horses should be allowed to breed and carry on the line. Their distinctive shape is evident even in newborns.