The Chambered Nautilus is one of the oldest surviving marine species on Earth, with a lineage that dates back more than 500 million years. Long before dinosaurs existed, these creatures were already drifting through ancient oceans, and remarkably, they have changed very little since then. Unlike octopuses or squids, the nautilus retains an external shell, divided into chambers that help control buoyancy. #Nautilus #DeepSea #MarineBiology #OceanScience #LivingFossil #OceanFacts #globalmuseum