The Sea Creature That Doubles As A Landlord

The fat innkeeper worm is a marine animal that spends its life digging elaborate U-shaped burrows. These tunnels are so comfortable that they often become shared homes for other species like crabs and fish.

This worm is essentially a professional homebuilder of the seafloor. As it eats, it pumps water through its tunnel, which provides a steady oxygen and food supply for its unexpected roommates. It is quite a selfless roommate, as it constantly maintains the environment for the various small creatures that move in. People in East Asia even consider this unusual worm a culinary delicacy.