I know its long overdue, but I just took down my first Thunderjaw. It was a very Jurassic Park feeling as I was using ruins of a building for cover and it kept sticking its head around the corner looking for me. I'm so overpowered now at level 36 and have all of the rare weapons and upgrades up to this point that after I tear blasted its disc launchers and armor away, I just kept peppering it with hard point arrows in the heart until it died. They move a lot slower than I expected but they're still awesome. For context, I'm doing story missions that are recommending level 16.