These are GREAT for chitin! Just ride an Argentavis and grab them with the talons! Then find a safe place, go close to the ground, and attack it mid air. Then go to the ground, and harvest with metal hatchet. No damage taken, a lot of chitin gathered! I have found them most commonly right on the southern border a tundra winter zone of in a jungle.
Level you fortitude, it'll allow you to take more torpor before being knocked, trust me, a few boosts and you'll see the difference, I know it's a stat alot of people dont like boosting, but it really helps for caves and stuff. It also raises your hyperthermic and hypothermic, meaning you dont get as hot or as cold.
Fairly easy to farm chitin from. Get a raptor/saber tooth and lightly encumber them. Agro the scorpions and walk backwards, make sure you’re slower than the scorpion. You’ll have less speed but better knock back so they will barely ever be able to land a hit on you