Beetles originated approximately 299 million years ago in Asia and Europe. Today they can be found everywhere in the world except for polar regions and comprise 40% of all insect species. Beetles have a hard exoskeleton and go through a complete metamorphosis of their body structure as they mature. Depending on the species, insects of the coleoptera order may consume animal and plant debris, flesh, waste material, fungi, pollen, flowers or fruits. Some types of beetles can harm agricultural crops while others consume harmful insects. Beetles are also the most widely consumed insect in the world and are usually eaten in their larval stage.