SimAnt is an excellent simulation of ant battle, but is easy to beat and the sound and graphic quality is poor.  Basically, you're an ant in a colony trying to destroy the red ants.  A spider (which somehow shoots lasers occasionally, don't ask me) and ant lions are among the existing perils.  It's pretty involved, with mating, behavior control, and foraging.  These can be left alone (except the first), but it can be tougher without them.  The full-game mode, the only one that I find worthwile, is too easy to beat and involves a simple strategy.  I recommend this primarily for people who like strategy games.