Look up griffin trap on YouTube they will say 8 foundations will work but 6 will work just fine. It says it works on griffins but any small to medium flying creatures that can be lured by you will and can be trapped in the griffin trap. You'll need to close the door in time to trap the argi but if your slow you need to sacrifice yourself and your ride. I recommend pterodactyls or pelagornis because tapejaras, griffins, and quetzals, are to valuable to sac off and quetzals are too big anyways. Then respawn, get your loot, and knock out the argi. (Note pelagornis can fit through the gaps or the door frame walls of the trap) (Note 2 don't use pipes or pillars for the traps walls, use wood or stone door frames)
I was flying my pteranodon in the red woods not knowing there was thlyocoleos and then out of nowhere I get ripped off my pteranodon and killed but luckily I exited without saving and got all my stuff back.