The Megacopta is a giant buglike creature that livesof photosyntethisism. Its shield acts like a leaf. It is often inside its shell feeding on sunlight. This also acts as protection and camouflage. When disturbed it will come out of its shell and attack.
The MegaCopta can act as a solar panel and battery with the right technology. Early in the game it will be a tough creature that can yield a good energy loot once killed.