To tame a Argy (argentavis) you will need 4 gateways, 2 Gates, about 20-30 tranqs (for 150 argy, with using a corssbow), safe place and prime meat. Firat, place a trap made of those structures written higher, find an Argy, trap it then shoot with tranq Arrow (better shoot in head, because it will gain 1.5x multiplier. I prefer feeling it firstly a dead dino, then knock it out. Feed it raw prime meat, because it gives better taming process.