They call this the living fossil. It is the only animal which has been remained unchanged for the last 400 years. I found it in New York Aquarium. The beautiful print on shell and its mysterious gesture caught my eyes and I took its photo. According to Marine Science Today, a publication of Ocean Lines LLC, “During prehistoric times, there were about 10,000 different species of nautilus, but only a small handful are known to survive today. Nautilus can nowadays only be found in the Indo-Pacific, where they inhabit the slopes of the coral reefs. They are the only cephalopods with an external smooth thin shell, matte white on the outside and mother of pearl inside, that is pressure resistant to a depth of about 2600 feet (800 m), although they live in a depth of only 1000 feet”