Taming a Rex is easy and very rewarding. You can tame it a few different ways. The first is to use a trap. Set 3 dino gates place a giant bear trap down in the middle then place the last one behind it and shoot till it knocks out. Or you can run and shoot it with Trang darts as you run, this is the easiest way as long as you don’t run out of arrows. Good luck! -droid