Taming these amazing dinos is pretty easy, as they are slow and don't bits as fast as a spino. If you have a Bird with 2k health or more you can use it to tank the rex and shoot tranq arrows. Or if you have 126% speed you can just run and shoot (which is what i do). if you're at a place with q lot of Rocks i would suggest running behind the larger Rocks and then tranq. Once it's down you shouldn't have to wordt about anything as their torpor drops very slowly and nothing But allos attack them when their down. When you get a 110+ put your first points info health until 15k, then 2k stam and the rest into melee and you have yourself a alpha Slayer.
I have figured out a new way to tame dinosaurs cut off the dinosaurs meat wise in the area try and keep the dinosaur in the area and send a dodo bird out to attack the tea Rex with bunches of Botox in and it had the tea Rex eat the Botox and it’ll knock it out you go feed it meet make sure you have plenty of Botox in and you’ll have a pet your ex and no I would not recommend trying this whenever your level one side effects may be dead dodo bird hey might find you and run but seriously You better find a good hiding spot