Always remember to build a roof on your base, because when I logged out on Hardcore mode when I was admiring the view on my roofless roof patio...my kill report said two of these a level one and a level 12 swooped down and ate my resting body.
For all you beginners out there do not just randomly attack these guys and expect a easy fight once you hit one a whole army will go after you killing you and probably your take you brought with you. Up so beginners can see.
I went to raid a base with 4 buddies, a rex, 3 carnos, and a bronto with a platform saddle and cannons. All we heard was a whistle and i swear about 50 of these little devil's swarmed the whole group, killing everyone in the group and one carno, the turrets shredded everything else, but the rex must have ran off and we never got a death message so its still out there in the jungle.
When in areas that have many dimorphadon remember to be careful and not to hit one by accident when fighting other creatures as you can easily be overwhelmed.your mount will not be able to save you as they deal damage directly to the rider.