Nautilus

A nautilus shell from Noumea, New Caledonia in my shell collection on the coffee table. I'm very sorry to say this as I would far rather it was swimming in the Coral Sea off the coast of Australia.

It is one of the finest examples of a logarithmic spiral and its markings provide camouflage from above. 

Adjusting its buoyancy by osmosis it can evade predators by pumping water in and out of the chambers in the shell. They don't have the complex brain structures of octopus, squid or cuttlefish but they do have a memory and a changing response reaction over a length of time.

They can go down to 2600 ft and can live up to 20 years. 

Take only photographs ...