By controlling the amount of gas in the empty rear chambers the Nautilus regulates its buoyancy. This allows for energy conservation when swimming

---

By controlling the amount of gas in the empty rear chambers the Nautilus regulates its buoyancy. This allows for energy conservation for the daily migration from the depths to surface water when feeding

---

Size: 4781px × 5500px
Location: Zanzibar, Tanzania
Photo credit: © Nick Greaves / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ancestor, ancient, arms, ballast, beak, buoyancy, calcium, carbonate, cephalopod, chamber, chambered, chambers, chromophores, coiled, collectors, common, daily, deep, display, external, eyesight, fossil, free-swimming, gases, grasping, indo-pacific, intelligent, internal, invertebrate, involute, lines, living, lustre, madagascar, marine, migration, mineralization, mollusc, nautiloids, nautilus, nutilius, pm, pompilius, predator, primitive, propulsion, protection, seas, shallows, shell, siphuncle, species, specimen, suture, tentacles, tropical, water, worldwide