Wait till it lands. Bola it and then hit it with narcotic arrows. Aim at the head. Only 4 or 5 hits and it's down. Just remember to get some narcotics with u. Its torpor decreases fast. Use kibble or prime meat. U can use raw meat too
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!