My taming strat: get a good argentavis to lure away + kill surrounding carnos. Park the argy on a high rock somewhere, then come in with a good Rex (at least 4500 health), aggro the Yuty, set Rex to passive, and jump off. Shoot the Yuty while it's distracted by the Rex. Make sure your movement speed and stamina are high so you can chase it down when it starts to run.