Tame using prime meat or mutton. Torpor drains somewhat quickly. Recommended to kill at least 5 jellyfish before hand so you can get enough biotoxin to keep it sleeping. Good luck, and have fun on ark.
To knock this Creature out,Use Your hands or a Club(Might Die iF used a bow) Feed it Rockarrots or Berries,Useful For taming a High level Pteranodon early game,Breeding big Dodos Can Possibly Be a Large enough one to ride and does not require a saddle.