There seems to be a bug with the regular kibble for these guys, so be careful! They gain 0.2% per kibble even though the wiki and dodorex says they eat regular kibble. I'm not sure if this effects non primitive plus servers, but it's definitely not fixed as of yet. Keep your kibble until this is fixed!
Love these creatures! I got an ankylo as my first utility animal thinking it would get me a lot of stone, but this is guy is the way to go. I just did a run for stone on my island and got over 1,000 stone just from a few river rocks. And they were small. They aren’t bad at swimming either and I love the feature of the rolling! So cool