While unable to gather metal from metal nodes, it is able to collect metal when attacking obsidian nodes. It is much better than the anky at collecting obsidian. However,there currently is a bug that prevents it from gathering anything but stone in the colder regions of the island map. If a large amount of stone is needed, metal and Crystal nodes give a significantly larger amount of stone per swing than standard rocks. Wild animals will not remain aggro'd to a curled up doed. So in the even of a losing fight with wilds, you can jump off of it, it will curl up at less than 1/3 health and you can kill the animals or take aggro and lure them away. If you stay on it it will stay uncurled until dead. Follow will also prevent it from curling.
The doedicurus gather the same amount of stone being any level does not matter which level you tame it and is perfect for farming element in extinction if you do not have mana or giga to do an ele vein