A good and easy trap for these is 3 stone behemoth gateways. You put up two in a V with a gap at the pinch for you to shoot/run through and then the third gateway at the other end. Put the doors on the V and when it follows you in pop in the last door and walk out through the gap. Make sure to kill the carnos before knocking out the yuty, they will eat it when knocked out. Now with the carnos dead go ahead and knockout the yuty and give it some kibble. No narcotics required. Have fun with your new Yutyrannus!!

More Yutyrannus Taming & KO Tips