These guys are common in the sanctuary area. They arent aggressive unless you aggro them or aggro the scouts that fly overhead. They attack wild aggressive dinos so they can help for early game survival. They also drop good stuff like oil, crystal, scrap metal and electronics.
Okay so I found this out about bolas. If they teleport to you they break out of bolas, but if you are close when you bola it it will just try to walk to you and won’t teleport so it will stay in the bola.(90% sure, this is from tests not facts)