As most know, the anky gathers flint, metal, obsidianand similar resources very well, BUT it comes with an added bonus. An anky can "gather" these items from a rock elemental corpse, so it can be used to gather tons of resources from them, as long as it has backup (I.e. Another tamed rock elemental) to help killing the wild ones. P.S. Ankys do NOT do "normal" damage to elementals, surprisingly.
If you're raiding a base and the have metal or stone walls, take one of these big, spiky, tanks with a wrecking ball for a tail and break the walls to allow any clan mates to storm the enemy base. Ho-ho-ho it's always a surprise when you do it in the dead of night.