Galgus
Emperor
- Joined
- Aug 22, 2012
- Messages
- 1,705
They can do, assuming spawn positions.
Just not for people that comfortably beat Soyuz or Apollo, I'd imagine. Bearing in mind that at those levels the AI gets such insane anti-Alien bonuses they tend to clear nests for you, making them even less of a concern.
No they can't, they never try to attack cities in a remotely coordinated even if you don't build a fence.
At very most they are a speed bump to expansion - if a ton of them spawned near you.