The Mobosaurs were saurian in nature, similar to the ancient dinosaur species of Earth which had been extinct for millions of years. Just like their dinosaur counterparts, Mobosaurs also became extinct, this time during the ecological catastrophe known as the Coming of the Chaos Emeralds. Four of the Mobosaurs survived due to the magical properties of the Chaos Emeralds, three of them becoming the Ancient Walkers and the fourth being Mammoth Mogul. (StH: #148, TMS: #3, SMM)