If you're unlucky a Compy might sneak through spike fences. It just happened to me - might have be a glitch or there might have been a gap in the spike wall. Look out for Compy sounds when taming!
I was lucky and only one came through. They're aggressive but they only attack you if there's more than one. Jumped on my flyer and lured it away.
This idiot, attacking my lvl 600 tek Rex
Compy, the most reckless idiot, attacking my lvl 400 wyvern...
Me and my rex level 236 walking to them
Compys:our fight will be legendary
My Rex:they are only curious
Where there's one, more will slowly spawn in. They won't attack you unless in a group of two or more. The bigger the crowd, the more damage they do.
Burn them.. burn them with fire
OH GOD COMPYS!!!
WHO ADDED THESE
Warning: If you hear one near you it won't attack, but just know there will be more and THEY will eat your toes!
Compys vibe with you until there are at least 2 and then they attack
Kill them kill them let them all die or they will kill you