The imagodon is an animal that is so hard to find that everybody is sure it doesn't exist (although, as you'll see in the book they will pay for their incredulity). There are also those who confuse it with the domestic camisaurous, but the imagodon doesn't look anything like it. Nobody has yet managed to capture an imagodon, so the best way of getting hold of one is to find an imagodon egg and hatch it. Of course nobody has managed to do that yet either...