As of right now dododex says that this can't be carried by anything but I picked one up with my wyvern. (I haven't tried anything else). Also I tried taming with meat but it wouldn't eat it, but it does eat berries. (DODODEX EDIT: Fixed!)
In Mobile version, megatherium can be resurrect on the obelisk after killing it in the dungeon (plase in mobile, where you can have battle with bosses). It doesn’t live in normal world. In mobile it eats an old kibble: baryonyx egg+raw fish+potato+mejoberry+fiber. It is very important information for mobile players!
To make honey last practically forever, make a fishing rod and equip honey, that is about to spoil, to the fishing rod, then un-equip it. It should refresh the spoil timer. Does not work with leech blood. Tested on PS4.
Dont compare stats to t rex, it says trex is higher but this thing harvests more and gets rage effect from killing anything that drops chitin. Which makes them do more damage and take less damage/torpor