What is special about nautilus?
Cool facts As a nautilus grows, it gains more living space by building new chambers connected to the old ones; adult shells have 30 chambers. The nautilus is the only cephalopod with an external shell. Much like zebras, nautiluses can be individually identified based on their striped shell patterns. The nautilus is the only cephalopod with an external shell. Much like zebras, nautiluses can be individually identified based on their striped shell patterns.