These things are incredibly useful. When taming, however, they have one fatal flaw: They're morons. They will run around and attack EVERYTHING regardless of how damaged they are or how strong the opponent. They also fancy themselves to be great swimmers. Flying around the tundra you will see many swimming around until they meet their untimely doom. Please tame as many as you can to help save them from their own stupidity.
I use wyverns to tame these, as wyverns are not affected by the scare roar thing. Just find a place it can’t climb to get you, then just tranq it. Once it runs get on your wyvern and chase it, then corner it and knock him out. Not the most safe way but it works.
The best way I have found to tame these guys is with 4 stone foundation walls. 2 stone wall high on each side.and one side have ramps. Kill all the car is with it. Shoot the Yuri from a distance and lure it up the ramp and in the cage. Done deal.