Mite

Mites are on 3 different episodes, and are #6 on Eaters, #10 on Diggers, and #4 on Freeloaders. Every night, dust mites eat dead skin cells. They also leave behind their droppings. If your pillow is 10 years old, then half of its weight will be from dust mites and their droppings. Another species, the scabies mite, digs into our skin using razor sharp jaws, and then spews out enzymes that dissolve our flesh. The female's burrow is a nursery for her babies, until they're ready to head to the surface to mate, before starting tunnels of their own. The rash is an allergic reaction to the mites waste products. A different kind makes homes inside the ears of moths, and eats, sleeps, and breeds inside the moth.

• If following the countdown of extreme Eaters, here is a link to the next contender, which is a little fish that just loves eating big fish.

• If following the countdown of extreme Diggers, here is a link to the next contender.

• If following the countdown of extreme Freeloaders, here is a link to the next contender, which is the world's only living fish hook.