The Field Museum beetle colony

The Chicago Tribune sent reporter Christopher Borrelli to the Field Museum to see how bodies are reduced to skeletons: “Inside the Field Museum’s hidden flesh-eating beetle room”.

There are nine beetle cages, each roughly the size of a home aquarium, each topped with mesh lids, each layered with a sedimentary bedrock of exoskeleton, excrement and freshly dead flesh-eating beetles. As Goldman lifted the lid of a cage and sifted around the white ribs and skull of a raven, she considered how many beetles were in this room.
She decided she didn't know — millions? Occupancy rates are unknown.
Now, to shiver your spines: The flesh-eating beetles of the Field Museum are a bit of a mystery. A stray dead chipmunk or two aside, "everything in this museum is documented, even the most mundane objects," Goldman said. "Yet these beetles: It's completely unknown how we got them. When I came here I was curious (about where they came from). This colony is a black hole.

It’s a great story for Halloween week, complete with creepy slideshow.