Such a pain in the arse...To tame that son of a biatch you need so many dodos.Make it rain dodos.OR knock out your paracher and let it finish it of to get a big "boost" at the taming progress.Then you got your own hunting dog...why you ask?You can tell him to search for dinos,traps and (i think)players.Once he spots the think you want a mark in your screen is appearing for a trap or dino.Usefull but sooooooo difficult to tame.
As much as i hate making a tip for this demon, put 3 dino gates down in a triangle and close them all. Put the troodon inside with a flyer or lead it in. Get a parge dinos about rex size. Maybe 2. Put it on neutral. Tranq it. Once tranqed use a tanky dino such as a carbonemys and stand near the rex. Release the troodon and let it attack your turtle while the rex slowly dies. If possible place 2 rexs asleep together to kill both at the same time.