Just stay in the very outside left of the map untill you reach the north, there should be a small penninsula, stegos rexes kentros scorpions and hyenadons seem to spawn there a lot as well, so be careful when doing this. Most of the time there's a war going on at that place also, if you use enough cluster grenades you can clear out almost everything. But if all you find is argees then find the highest one, tranq it, kill the other argees, or tranq them too, tell the highest one (once it's tamed) to stop doing cocaine to get so high, and enjoy your argees. Please upvote so more can see this tip.
An argentavis can't fit through a ceiling with one tile missing, but a pteranadon or lymantria can. Build a trap with one corner ceiling missing, aggro the argentavis, fly in one side and out the missing ceiling tile, and land. Dismount, run around, and close the entry door. Tame safely at your leisure.