We have tamed a mating pair today and best advice is to kill everything around it on and the carnos on a wyvern. The wyvern is not affected by the roar but everything else is. Argy will lose its shit and go nuts. They are also fast as lightening so ground taming is horrible. Definitely recommend kiting to a trap on a high health wyvern. Let it bite your booty-then in and up through behemoth gate. Land behind because it holds agro. Shut the gate and done.
These guys can be netted with a net gun. Tranq darts are affective but i knocked out a lvl 135 with about 15 shocking tranq darts. Great for boss fights cause of its courage roar ability. Pair with an army of rexes and you’ll be a force to be reckoned with.
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.
If you're lucky, you can find one of these alone. I would recommend targeting one that is alone, unless it is too high of a level or too low. Therefore you don't have to worry about Carnotaurus trying to kill you. Kill off anything ot might try to pick a fight with, like mammoths (you can use the prime meat from them to tame it). It takes a good amount of arrows so best if you use tranq darts instead. Just be careful of its roaring because there could be Carnos nearby.