Chambered Nautilus 7"

Nautilus are most closely related to squid and octopus. The shells have a series of chambers connected by a tube. When it is born a Nautilus will have just 4 chambers but it will add more as it grows, as many as 30 chambers on average. The chambers contain a mixture of gas and seawater which amounts are adjusted to allow it to raise or sink in the water like a submarine.

The Nautilus itself have up to 90 arms they it uses to catch fish and crabs to feed on. The arms have tiny hairs that are coated with a sticky substance to help them catch and hold on to their prey.