HOW IT WORKS: There are two types of creatures: Prey, and Predator. Predators are red, and Preys are green. Each creature starting out is given a fixed amount of energy, but slightly randomized speed and size. The more speed or size something has, the faster the energy drains from the creature. When a creature runs out of energy, it dies. Speed at which Energy Drains = (Size)^3 (Speed)^2