If one of these spawns in your base, have one of your tribe members leave the tribe and unclaim a flier, have them claim it, then fly it and lead it away. If no one is in your tribe, give up because theres nothing you can do.
Easily killable with a wyvern. Lightning and poison easiest down to longer range in attack. Just hover above and light it up :) killed my first today and it didn't touch me once. Just remember to watch stamina ;)
The fastest way for your entire tribe to rage quit is to have one of these randomly spawn in the center of your base. Oh, that doesn't happen? Think again, literally just did. What the actual f*** Ark??!!!