Ankylosaurus are some of the best metal gatherers, and they also have severe metal ore weight reduction, so that 256 metal can only weigh 68.00 kilograms instead of the full 256 kilograms. If you make a forge-centered base on Herbivore Island in The Island Map, in the far south-east, the metal there respawns often, and an ankylosaurus can get up to at least 108 metal per swing.! Bring a high-weight creature as a pack mule along with you as well, though, as the weight will stack up eventually.!