If you're having trouble finding one, get on your bird and go to about halfway up a redwood tree. They like to climb trees and then glide from tree to tree so your chances of finding one in the trees are a lot greater. I found a group of five once in the trees. However, they will glitch when being grabbed from a tree. It might not always be in your birds talons... Anyway, if on the ground, bola it (without scaring it away like a tapejara) and tranq it. It has a low health pool though, so try to watch your arrows.
They are very fast and will only eat chitin. They run away when they see you or you tranq them. Breeding takes chitin too so have lots of chitin. They hide in trees and I have only seen females so Esther males are rare or I’m very bad at finding them
These should be shoulder mounts. Disco, my Archaeopteryx from a dungeon, is absolutely amazing. Maybe have the saddle icon for gliding, and the pick-up icon for a shoulder mount? Just an idea. I love this dinosaur.