If you have a tribe-Have a friend carry you on an argentavis, and shoot it till it goes down.

If you're alone- you can: make a trap out of wood or stone with a bethemoth gate with a box inside so you can shoot it safely.

Or you could: make a ballista and a chain bola to subdue it then shoot it down.

Or wildly shoot it and run and hope for the best :)

You can kite said Rex into a rock or stand above it and shoot it if it starts to run after a couple shots it is not going down but simply finding something else to attack or repositioning itself if it is the first then chase it or shot it again but don't let it hit you hope this helps oh spike walls around it too

There are multiple places to find them in the center map but in the original map and scorched earth.in sorched earth you head to the center of the map or to where the giant spikes are you can knock them out any way that you can but I suggest to bring as many tranq darts as you can or tranq arrows .and they spawn just about anywhere near the red or blue obelisk in the normal major in the center around red wood

Rex's tend to get stuck on rocks easily, so what you should do is find a valley like spot. (( all on one side and then another on the opposite side) then what you want to do is use a bird to find a way up to the top of the cliff line, start pounding tranqs. Onice it drops, your then have a wall (unbreakable) and then put spikes around the Rex for extra protection.

Make a 4 by 5 box base (specifically stone material to insure no breakout) make three sides of the box with door frame walls about 4 high (use stone material)to make shooting the tame easy and efficient to shoot through. On the 4th wall side add 3 rows of ramps to lead the tame into the trap box(metal or wood ramps Will do). In addition u can add a Dino gate to get the tame out of the box once tamed or just demolish the walls- I hope this was somewhat useful to taming ur creature :) Have fun

Once knocked out, you can honestly get away without taming spikes if it's just a good Rex. Nothing naturally attacks them in the wild if it's not fully tamed. You don't need to waste material and sit next to the rex if you're kibble taming it for 3 hours. Just knock it, fly back 10 mins before torpor time and make yourself productive. Unless you're on a busy server with a lot of traffic

You want this big boi? well we need preperation in the base first, RESOURCES:

Alot of tranq darts with a longneck rifle, Some behemoth gateways and gates, Prime meat or eXtRoIdOnArY kibble, some knowlege on taming traps, and a bait unless you use yourself, AND OF COURSE the rex tek saddle or rex saddle.

And there you have it folks! A tamed rex for you to control.

Here’s something cool on mobile. Once you get a Rex to run from you, you can go back to it later and it it sees you it will run again. How to tame one my way: get tranq arrows and just shoot it down. Or just use tranq darts. Shoot it, run, shoot run, FUN AF it like playing tag. REX DONT SWIM THEY SINK

Rex taming tips, noob-pro.

Noob- Bring the rex to a cliff side using something faster than it such as a raptor or a flier, use a bow or crossbow with tranq arrows hitting headshots, fill with 100 raw meat and feed 50 narco berries every time toper hits 1/4.

Intermediate- Build a 2x2 stone trap with double doorways 2 high surrounding, add ramps to 2 of the 4 sides then your trap is done. Next use a raptor or argent with decent health to bring the rex into the trap, use tranq arrows with a crossbow or tranq darts and a long neck to toper the rex out, finally put 15 exceptional kibble, or 100 raw meat with 50 narcotic to tame.

Pro- Build a metal 2x2 out of foundations, surrounded them with two tall double doorways, have the rex follow your mount of choice into the trap, then tranq it using a long neck and darts, finally feed 6-20 exceptional kibble to it depending on level and it's yours!