Yutyrannus usually travels with Carnos, so deal with its escort first, then lure it into a sturdy trap or net it; you can also shoot from high ground. Knock it out with tranq weapons while keeping clear of its fear roar, which can panic many mounts, and be ready to pursue it when it starts fleeing as it gets close to unconsciousness. It may take a while to begin eating after it’s knocked out, so be patient.