So what I usually do in single player is build stone walls making a square…
So what I usually do in single player is build stone walls making a square shape, get and argyle grab them drop them in this keeps them safe from predators and from them escaping, just do and extra wall on top to be sure, then build a storage box where I have boLas, whenever I need their loot I just Bola them as this can last for about 30 seconds get your bird which will carry the loot in first stop them in the enclosure, then Bola or tranq them out which tranq in is more better especially if you have more than 2 and you can do this outside of the enclosure which is highly recommended because these guys cannot Destory stone once mobilized or tranq out get what you need fast and get out these guys torpor drop very quickly, and a very special note it's best to build the enclosure and leave these guys where you find them as they will have less chance of despairing don't waste your time taming these guys you get so much more resources when they are wild from their dams.
More Castoroides Utility Tips
These things are amazing! If you find a wild one, then that’s great because you can raid it’s dam for some cementing paste. Now, if you tame one, the beaver sadly won’t make any dams. But, you can now harvest a bunch of wood with it if you put it on wandering or use a saddle. If you think it’s a bit dangerous running on the ground, let me introduce you to one of the greatest things in this game for gathering, auto-harvest. Just get an argentavis and it’s saddle, grab a tamed beaver, and go up to a tree and let the beaver hit it. ( Put on wandering for the beaver for it to work) This is way safer than being on the ground. To get way more wood, put some levels into melee and even weight if you want to. Auto-harvest also works with ankylosaurus and doedicurus.
My last tip was on the ichthyosaurus
-Some random Ark Mobile player