Yet another parasite that turns an animal into a zombie…Sacculina is a kind of evil barnacle that invades crabs and eats them from the inside. It lives throughout the body of the crab and makes the crab act like it’s laying its own eggs. But it’s actually spreading the eggs of the Sacculina and caring for them as its own. The sacculina becomes the replacement for the crab’s egg sac. You can see it in this picture the oval yellowish thing on this poor zombie crab.