Flies are created through a process called metamorphosis. Metamorphosis is the process by which an organism undergoes a transformation from one form to another during its life cycle. In the case of flies, they begin their life as eggs. These eggs are typically laid on or near a food source, where they hatch into larvae, also known as maggots. These worm-like maggots feed and grow until they are ready to transform into pupae. They spin a cocoon around themselves where they enter a resting phase during which most of their body tissue breaks down into a liquid form. This liquid then reorganizes itself into the body structure of the adult fly. The fully developed adult fly finally emerges from the cocoon or shell, ready to mate, reproduce, and start the cycle over again.