7. The Cuttlebone The cuttlebone helps to control buoyancy and keeps the cuttlefish afloat. Cuttlebones have forward chambers that are filled with gas and water filled chambers in the rear. This calcium rich cuttlebone changes in density to allow the mollusk to control it's positioning in the water. This balance of gas and water filled chambers keep the animal in neutral buoyancy. The cuttlefish allows requires the use of it's mantle and fins for mobility to slide through the water. The cuttlefish will suck water into the mantle cavity and the muscles inside the mantle will force the water with such force that it propels the cuttlefish through the water.

9. The Eye of the Cuttlefish The cuttlefish has relatively large eyes compared to the rest of it's body, and a unique “W”-shaped pupil. Although the cuttlefish is one of the most uniquely colorful animal in the world, it is completely color blind, which is why it is truly amazing how they can match their natural background so perfectly. This suggests that the cuttlefish can not rely on the color of their background or by the color of their own skin to tell if they have matched their surroundings. While focusing on any particular object, the whole eye is reshaped by moving the lenses, rather then the reshaping of the lens as a focusing mechanism, as it is true with humans.