I tried finding one of these, but it's not easy. Eventually I found one swimming aroud and I tried to chase it to shore (It's harder than it sounds). Eventually I got it to a rock underwater, and started feeding it bio toxin, but 3 bio toxin in I got eaten by a meglodon. I respawned at my bed and went to where i was taming it, and it was gone. 😭 😭 😭