Easiest way to tame one: go find one(I found a lot near the blue obelisk), pick off carno's with argy. Place behemoth gateway and gate, open gate, behind behemoth gateway place another behemoth gateway without gate this time.
Place a third behemoth gateway with a gate closed behind the one you just placed. (Make sure behemoth gateways are close to each other, I mean... CLOSE!) Place large beartrap inside the trap, then lead it into trap. Close gate and tranq. When done tranqing wait for it to starve (bring narcotics just incase) last step... feed it. Now it is yours. (Try to bring an empty cryopod)
It really is that simple though, they can't reach you or your flier on a big enough rock, so if you don't want to make a trap you can just shoot down from a rock or cliff once the carnos are dealt with. Be ready for a goose chase once it starts running.
I once perched on a wall with a desmodus while trying to get a good look at a yuti. Obviously, it saw me and roared and scared my bat but my bat didn't even move, he just stuck to the wall with the dark blurred fear effect or whatever. So if you are taming a yuti, I highly recommend a bat as you can also shoot off of them while flying or perched.