And since we're sliding down the animal scale, there is a genus of deep-sea worm called _Osedax_ (also known as a 'zombie worm') that specializes in boring into the bones of whale carcasses. As with specialist bone-eating vertebrates, the aim is to get at the yummy stuff inside the bone.
Which is pretty much the entire bone -- whale bones are extremely spongy, and the holes in that sponge are all filled with fat. Preparing a museum-quality skeleton is a nightmare that takes years, I've read.