Editing UFOs and Aliens (section)

== UFO Behavior ==
UFOs have four "modes" of behaviour: 

=== Exploration Mode ===
In this mode, UFOs lower their speed to 10, and head to a random position within the current chunk or adjacent chunks, looking for signs of civilization

If the chosen location happens to be within the boundaries of a village, the village is listed as an attack target. The UFO enters normal flying mode, and prepares to launch an attack. 

Otherwise, if the location is not inside a village, the UFO continues in exploration mode.

=== Normal Flying Mode ===
In this mode, UFOs set their speed to 20, and head to their target village. 

Within the city, the UFO randomly selects a location next to a building, and attacks with their laser beams. Every round, they attack 3-10 times. 

=== Chase Mode ===
When a UFO in the exploration mode or normal flying mode is hit by another creature, it enters chase mode.

In this mode, the UFO raises its speed to 50, and pursues and attacks the closest creature. 

=== Flee Mode ===
When a UFO in the exploration mode or normal flying mode is damaged (but the damage is not dealt by a creature), it enters flee mode.

In this mode, the UFO raises its speed to 100, and flees to a random location in the current chunk or adjacent chunks.