bone-eating worms

Discovered 'monster eating bones' in the depths of the Earth
The bodies of 3 crocodiles have been swallowed up by tiny monsters on the ocean floor, and their bones are no longer available.
Detecting weird zombie worms
The researchers said traces of the worm worm Osedax (bone-eating worms - also known as zombie worms) were discovered in a 3-million-year fossil specimen in Italy.