Monomad: Hermit Crab with a Broken 'Helmet'

Walking along the beach this afternoon, I noticed a shell lying on a pile of moss. "An empty, broken shell," I thought to myself. A moment later, I saw something moving inside. Those claws and eyes slowly came out. Yeah, this shell house still had an owner: a hermit crab. What a pity. Maybe that shell was rolled by the powerful waves so that it hit the big rocks on the shore and broke. Nevertheless, the shell could still protect the hermit crab. It still had a "helmet" and a home.