In some servers, bolas may be glitches and will not work. I've already encountered one server in particular (on Xbox) which is primitive plus server 2. If you encounter a low level pteranodon or other Dino early in the game and you have a bola on you, use it to test if the bola will immobilize the Dino or if it is glitches.
If flying/wandering: *various chirps and calls*
If startled by player (must be punched while wild to achieve this status): AHHH! (These lines are reused when leveling up)
If punched/hurt in any manner: ACH! ULGH-WUAGH! (Same lines as Coelacanth)
If killed or while unconscious/asleep: EEEEEEEEH! (Reused Coelacanth death-sounds)
When using tranq arrows shoot'em anywhere but the head. 3 arrows should KO them. I was taking a level 36 ptera. I recommend using kibble as raw meat takes a lot of time and narcotics. Don't try it if you don't have a trike or anything effective at gathering.