Knocked out a 135 but as soon as I knocked it out bugs attacked it. It was down to 50% taming efficiency. I woke it up and knocked it out again but got attacked again by raptors. I still tamed the thing but it’s not as good as I would have liked
When knocking pteranodons out, be sure to have a bola, it doesn't take many tranq arrows to knock it out. Once it is down, put spike walls up around it (with a little space so you can go in and out) so it doesn't lose taming efficiency or die.
To kill pretty much anything on these birds, tame a high level, then pump stam to 3k, then the remainder in melee. Barrel roll into alphas etc. But keep eye on Stam. Never regen Stan on ground, know your ledges!