Worst thing that's ever happened was when me and my friend encountered one, don't know what it stole. The Pego went near Megatheriums, then one of our Raptors attacked the Megatherium, killed both of our Raptors, while my friend was running away with our Direwolf, which was also killed.
this is for the noobs and anyone who is confused, they DO EXIST IN ARK MOBILE but they are exclusive to the eerie dungeons. The only way to get one is to kill one in a dungeon, take the implant, and then revive the creature in the world, and then tame the beast. It's too much work for a little hamburgler