The correct answer is Huayangosaurus, middle Jurassic.
A genus of stegosaurian dinosaurs called Huayangosaurus lived in China during the Middle Jurassic. The name is a combination of the words "Huayang," another name for Sichuan, and "Saurus," which means "lizard." About 165 million years ago, during the Bathonian to Callovian stages, it lived, some 20 million years before the arrival of its renowned related Stegosaurus in North America. It was also considerably smaller than its well-known cousin, measuring only about 4 meters (13 feet) long. The sauropods Shunosaurus, Datousaurus, Omeisaurus, and Protognathosaurus, the ornithopod Xiaosaurus, and the carnivorous Gasosaurus shared the region's Middle Jurassic terrain with Huayangosaurus, which was discovered in the Lower Shaximiao Formation.
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Self defense because in order for them to seem more powerful and they also needed i to gain more protection.
