http://steamcommunity.com/sharedfile...66&searchtext=

[DESCRIPTION]
Re-balances alien AI to make them more territorial. They are more likely to attack units and destroy improvements. Things will get worse as they become more hostile (i.e. you kill them they will attack more).
Seige Worm to Normal Alien ratio changed. There are fewer SWs when at the start but they become more frequent (by 3x) every time they become more hostile.
- Aliens should attack more frequently
- Aliens should defend nests better
- Aliens will have more seige worms the more hostile they are
- Aliens should retreat less