Best way to tame is make it follow you to a taming cage with a dinosaur gate and door frames as walls so you could walk out once inside close the gate now go kill something and drag the body to it once it's eaten the body you should see green light coming from the bird that's when you quickly shoot it with trank arrows and it should almost instantly tame ...just try it
To tame one easy all you have to do is kill something so the argent Avis can eat, and while it’s healing you must knock it out with tranq arrows or darts. If it is knocked out while healing it’ll starve immediately and it’ll tame in seconds no matter what level!
If you lose your argys go to the place that shows your character press the tames button which says how much animals you have, Look for your argys name press request, then wait. It will tp to you, if it’s alive.