Tame them by getting their eggs. Use a whip while you're grappled to a flyer. They need five fireplaces to hatch. It doesn't take that long for them to grow, but to hatch them it's thirty minutes. They can be found easily on the white cliffs along with their eggs. I don't care if you like this or not I just wanna give tips.
These guys are strong and really good for bosses. I personally am currently breeding mine to mutate a really powerful army of them. Highly recommend them for bosses.
Also say my wild Dino max lol is 150. If I find a wild deinonychus that's lvl 150 then I kill all the other deinos, steal all the eggs and run OUT OF RENDER DISTANCE. By doing this the 150 is the inly one that can fill the nests and you will get deinos lvl 150 with the same stats for breeding and mutating.