Non-Human Behavior AI
Most games are designed and built by humans, so designing and implementing AI behavior for non-humans comes with some interesting challenges, but also amazing opportunities. Mammals, fish, and insects all have their own variants on behavior that we as humans don't have personal experience with. Some interesting behaviors to consider include: flocking, hive-mind, predator/prey relations, and natural selection / evolution. These can add amazing interest and variety to your enemies and bosses.