When I first started playing I saw one and was like, “hey, this thing it small. It should be easy to nock out and take.” About 15 had gang up on me by the time I got to my bace. Tip for new players: DO NOT UNDERESTIMATE THESE THINGS. And be careful not to pick up an egg by accident, too.
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.
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.