If there are three or more and your new, try doing it the hard way (make sure your patient). Get 15-25 tranq arrows or toxicant arrow ( the same as the tranq arrows but a lot better torpidity), get 100 narcotics just be sure that it doesn't wake up, get 80 raw meat or 10 raw prime meat, and get your argentevis with you.
If find three, try waiting until one splits apart by leading all three of them in a pack of herbivores and they will start attacking others rather than joining with the pack, as soon as the other one is too far from its pack go ahead and kill it and do this one by one to each allows (except the alpha, which is your goal to tame).
Yesterday(Oct 21 2020) I tamed to of these beauties! One was lvl 209 and a female wen I tamed it and the other was a male lvl 80! I also bread them,I used a pheromone the baby is fine tho, the tip here is how I tamed them. Ur gonna need a tapejara and tranqs.OK,
1.go to the red woods on ur tapejara
3.land on a tree with ur tapejara
4.WACK TRANQ DARTS ON ALLO HEAD!
5.wen its out, check the area
8.........that's all..........hop u like ur allo......
My name is Ashham and I hop u like it goodbye and..........
Think about this: The taming in ark is crazy. The last thing the Dino would remember would be you impaling it in the face with toxic arrows before it gets knocked unconscious. And then somehow it eats while knocked out which makes no sense and then wakes up and loves you till it dies.