Ants aren't very smart, yet a colony of ants will exploit
food sources in order of their distance from the colony. In other words, we
could use a colony of ants to sort a list of numbers.
In the Ants model ants (turtles) wander around randomly. If
one finds a piece of food, he brings it back to the ant hill, leaving a
chemical trail as he goes. The chemical has a diffusion rate (the width of the
trail) and evaporation rate (how long the trail lasts). Both of these can be
controlled by the user.
If a wandering ant comes across a chemical trail, he follows
it to its source. If he finds food, he brings it back to the ant hill and
reinforces the chemical trail.