Because of the aggressive behavior of the Argentavis. It is quite easy to get there attention and to knock them out. Attack them once with whatever you have and then run to your Base or taming pen. The Argentavis will follow you the whole way. After u trapped him in your taming pen, you can start shooting tranqualising darts or arrows at him. Once he's knocked out feed him and place the saddle I the inventory. Once he's tamed you can ride him. The Argentavis will have around 300-400 carry weight so be careful that ur not to heavy or else u can sit on him but can't move in any direction. Like that you would be an easy pray for any Predator.
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.
1-2 tranq darts in head and he’s knocked, go get some meat and kill some of those jellyfish and get bio toxin then put the bio toxin in it and feed it until the argies hunger is on 1000 or less then put all your meat in it
You can instant tame an arg, just need to almost knock it out, and check its torpor with a magnifiant glass, stop shooting it and give it a dead body. Once the arg eats it, shoot it really fast while it has its healing buff. If it’s knock out and still has its buff, the food will drain super fast. GLHF!
How to tame one easy : get a pteranodon with saddle, get icthy with saddle, find nearby leed, and get tranq arrows (35 or 40 maybe.) step 1: mount your icthy, and scrape meat off of a leed until you get prime fish meat ( one leed is in front of my base, one is near me, one is at herbivore island, one is half way to herbi island, for me.) step two: get 35 or 40 tranq arrows ( you might miss and you need alot to knock it out)
step three: fly to red peak on pteranodon (make sure its attack target) find a flying, solo argy. step 4: aim and shoot at it, when it flys at you its even better the target gets wider step 5: once its unconsious put prime in its inventory step 6: there is your very own argy!