Figurine NautileWith its spiral shell and tentacles, the nautilus is one of the oldest marine animals still present on Earth. A true living fossil, it has existed for over 400 million years. Surprisingly, unlike octopuses and squids, the nautilus has an external shell divided into chambers filled with gas and liquid, which allows it to control its buoyancy. It mainly lives in the depths of the Pacific Ocean and sometimes surfaces at night to feed on fish,