Tamed 2 ( lvl 125 and lvl 90 ) did some upgrading mostly to health and melee. Turned my back to cook some meat. Hear scary music, see lvl 130 Rex's corps just flying over my head.

Build. Around. It.
My Gigantopithecus luv 150 was at 99.9% tamed. Terror bird charged in and made it be at 0%. I’m pissed.

No gille armor all you need to do is crouch behind it and shove berries up its butt...I'm not kidding

Get kibble....grab with crabs left claw...stand on crabs claw behind it and shove kibble up it bum....