MOBILE Argy trap (also works for ROYAL griffin, tested on both):

Takes 4 stone gate frames, one reinforced gate, and 3 stone pillars. Pick a spot that is flat and also away from any predators, including compy and dilo. Face going the same way you plan to fly them in, so that gate opens in. Place first frame then slowly walk forward until the frame isn't snapping at weird angles and place it, this gets the spacing right. After placing 4th frame, put pillar right in the middle of it, then stack the other 2. Now walk backwards until you can place the gate in the first frame, I place a torch out front a ways to locate more easily. You now have a perfect Argy trap.

Using pteranodon, agro the Argy then lead in low and slow, opening the gate when you reach it. Pteranodon can slip right through but Argy cannot. Land and hop off, while Argy stays agro on your mount, run back and close the gate.

For taming, shoot with tranqs to partially torpor, sleep, then KO, balm, and rapid tame with raw prime meat (stego is my goto).

-Good Luck

I tamed a level 20 by accidentally starve taming it. I had shot it with all the tranqs needed, but I was running, so by the time it went out it was on top of a big rock, forcing me to build a that structure and a ton of ladder up to it. Lol it tamed real fast once I got to it because I had a vulture filled with mutton on follow.

I personally prefer travelling to the mosh pit (On the western coast) and they are so easy to tame! You only need a crossbow and tranq arrows but if they are a higher level I’d recommend building a cage so that the don’t fly away where you can’t reach them (unless you are using tranq darts and a longneck). Kentros, Hynaedons and other argents spawn here so I kill them for their prime meat and throw it into the argent! Enjoy your new argentavis!

Make a pen 6x2 dino gateway and a couple of rows of doorsways (no doors),leave one wall tile out. Get Argi to follow you back to pen on pteranadon stop at pens gateway,wait for Argi to hit you fly out missing wall tile straight ahead (at a sprint speed otherwise you'll get stuck), once out park bird right infront of Argi....run round and close gate. Better to build this just out front of base incase it goes to attack dinos but also makes it a nice close and safe tame. Good luck

YOO GUYS I think I just made up my own Argy trap randomly from meh brain :O Its cheap, it works well even on mountains.

I used this for trap testing:

1. A Stone Foundation

2. 2 Stone Ceilings

3. 4 Stone Railings

4. 2 Stone Pillars

After building the trap I got attention of an Argentavis and I run trough the entrance of the trap and put 1 railing behind it and BOOM. It worked lol

Note: I can't explain how the trap looks like because we can't share images here.