Another way to tame these guys that works pretty well for me is to build an Argi trap. Be sure to build it somewhere there isn’t a lot of other dinosaurs wandering about. Get on a decent lvl flyer yourself. Wait until the tapejara is flying. Equip a good amount of rare flowers to your tool bar. Eat one and fly by him. he will begin to chase you. Keep an eye on your timer and continue to eat them and kite him until you and him are in the trap. Close the doors and let the flower ware off. He will not attack you anymore once the flower is through. At that point you can leave the trap but be sure he doesn’t escape. Shut the doors behind you and there you go. Proceed to tranq him and feed him as normal. Sounds difficult but it has worked several times over for me where trying to bola him with Gilly tends to be frustrating. Good luck!