A living submarine
The nautilus is a Cephalopoda mollusc, like the octopus. Its shell is separated into compartments in which a mixture of gas and liquid make it ascend and descend like a submarine. Its mouth is like a beak surrounded by about 90 tentacles which they use to catch their prey and to attach themselves to surfaces. Their ancestors were already living in the oceans 450 million years ago.
- Average size: Diameter: 15 cm
- Average weight: 1.5 kg
- IUCN red list status: Not evaluated (NE)