I find that if you go to the north western corner of the map you find a good amount of these things. Find your desired bird then just lead it back to the safer half of the beach. Do NOT do this on foot as rexes allosaurus sabers raptors and many more are out for your blooooood.
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
If you need an argy and don’t have time to tame one with a trap, just go to carno island, kill a Dino in front of an argy and let it harvest its body. When the green health icon shows up on top of it, knock it out with tranq arrows and the argy is instantly yours.
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.