Special Features of the cuttlefish include:
Cuttlefish have very good eyesight. They have binocular vision as the visual fields for both eyes overlap. Cuttlefish have W-shaped pupils that contains a lens that is similar to humans but focuses in a different way.
Cuttlefish move by gently undulating their skirt-like fins. They glide smoothly through the water and can vary their depth easily. The cuttlefish bone is a porous, gas-filled chambered shell which gives the cuttlefish neutral buoyancy.
To rise or sink in the water, the cuttlefish varies the proportion of liquid to air ratio within the cuttlefish bone. The more liquid in the cuttlebone, the lower the cuttlefish sinks in the water.
For fast movement through the water, the cuttlefish uses a form of "jet propulsion'.It draws water into the mantle cavity through the mantle opening and then contracts the mantle muscles which forces the water back out through the siphon. The cuttlefish then shoots away. The siphon is flexible and can be swivelled into different directions in order to steer.
When a cuttlefish is threatened, it has three ways to escape:
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