At around level 50 it is a war machine against dinos, just make sure it has atleast 3.5k health and it can kill an alpha raptor, even if you die 10 times in the process. This was not fun but was amazed when it won the battle
The Ankylosaurus is, in my opinion, one of the best dinos to tame as a low level. Not only is it the best dino to gether metal, it is also a great taming mount, because it can collect berries and can kill little things like Raptors easy. This will be one of your most used dinos when you get into the higher levels and taming an Anky as soon as you can make the saddle (lvl 40) is highly recommended.
With the recent update Ankylo can hold four times the metal because it weighs less as long as it's in ankylo 's inventory. So 100 metal will weigh 25lbs instead of 100. Also tamed Anky will have more speed than usual. Happy farming ^__^ -Geo