Be careful when traveling through the swamp, they can launch at you and drag you into the water. If you act quickly, with either using a Bola or Attacking, you can escape. A high level one will be extremely dangerous if unprepared.
Screw these guys. I hate them, i hate the mothers that birthed them and i send them to hell. They have killed me countless times and i think ive killed, nope cant get close enough to kill them. If spotted run, run far and run fast. If you spot one while turning a corner and its just there 20 ft away start crying and hope it didnt see you.
So, me and my tribe mate set out to tame a Quetz, I picked my tribe mate up on an argentavis and searched for about 20 minutes. We found a level 115 above the swamp and started tranquillising it. After about 30 tranqs a kapro jumped out the swamp and stole my tribe mate. I went to find him, I never saw him or the Quetz again...
No fair play here! There was no warning, me and my tribe mate were getting some exclusive swampy items with our igunadon when it lunged at my buddy, knocked him off his mount and then ate our igunadon! DO NOT EXPECT A WARNING WHEN DEALING WITH THESE DINOS!!!!