Dododex
ARK: Survival Evolved & Ascended Companion
If you have an Argentavis, you can grab a wild Castoroides and plop him in a…

If you have an Argentavis, you can grab a wild Castoroides and plop him in a preprepared enclosure near your base. We originally planned to tame him in there.
Turns out, if you don't tame him, he will eventually build a dam inside the enclosure that you can easily harvest from outside the fence. You just have to tranq him afterwards or he will go and destroy the fence.
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
Everyone. TAMING OR KILLING THESE MFERS DOESNT MATTER THE GAME WILL RESPAWN MORE. Also when you take stuff out of the dams, dump the rest of the stuff out to destroy the dam. They won’t fill the dam again until it’s destroyed. Nobody likes opening a damn to find a bunch of wood!!!!