very useful for collecting metal and flint, however if you are looking for an animal to collect stone, tame a doedicurus that are great for that. both are great animals and easy to tame. you will definitely want to have them in your base
The best way to get metal is tame a few of these guys, then get in a tribe if you dont already have one. Then ask your tribe members to grind with you and you'll get loads of metal! I tested this out too. And make sure you alternate between weight and strength to get the most.
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