If you play on mobile and want to do the roll then go to settings left or right multi tap and chose alt attack 2 !!!
NOW FOR THE MAIN PART--- THESE THINGS CAN KILL GIGAS the normal roll does decent damage but if you roll and attack a dino while watching the dino through spyglass you can deal tons of damage (this works in mobile idk about other platforms) i killed tons of rexes,brontos,allos..etc. using this trick
Upgrade their stamina and weight a LOT. This flyer is worth it, upgrade his health and melee dmg enough and it can take out raptors on its own (my lvl24 pteranodon killed a lvl20 raptor and succeeded with half of his HP). These lovely birds are easily encumbered by the weight you're carrying so it's preferent if you use lighter armor and leave a few items in the storage so that it's not slow.
How to do barrel roll on mobile: Go to settings and then go to controls then either go to left multi tap or right multi tap. Then select Reload/Alt attack2. When you are done, go and press on your screen twice on either left or ritght side. And you pteranodon can now do a barrel roll! Disclaimer:wastes stamina alot so be careful. Like so newbies see this!
When I was lv 50 or so I got rid of my first ptera to make place for an argy, but then I met another ptera just lifting up from the ground. It was a mere lv 7, but with an almost pure black body from the tip of its beak to the edge of its wings. Just spectacular. So instead of the argy I was about to knock out, I tamed the ptera, and named her Duskwing. (I did get the argy later on but not by replacing a ptera) Even to this day she's still in my camp, as a lv 47, faithfully watching over the coast, ready to bring me swiftly to wherever I want to go, and providing nutritious eggs.