Just caught two of these beastly animals today with my son. The best way to capture one is three metal signs in the form of a triangle with a bear trap in the middle of it. Lay the first two metal sign down in a 90 degree angle and put the bear (large one) trap in the middle. Get the megatherium to follow you into the bear trap, and put the third sign on the outside of the animal. Tranq it up and vola you have a Megatherium.