It has an arm span that can reach 14 feet (four meters). The giant Pacific octopus ( Enteroctopus dofleini ), found off the Pacific coast of the United States from California to Alaska, is the largest octopus species in the world.
There is tremendous range in the size of octopus species found in U.S. They are believed to be quite intelligent-capable of learning, using tools, and remembering locations.
#Octopus mouth skin#
Their skin contains cells called chromatophores that allow the octopus to change color and pattern. They are about 90 percent muscle, and because they lack bones, they can fit through very small spaces. Octopuses are solitary creatures excellent at camouflaging and concealing themselves. Rather than iron-based blood, their blood is copper-based, which is more efficient at transporting oxygen at low temperatures and makes their blood blue in color. Two of the hearts work exclusively to move blood to the gills, while the third pumps blood through the rest of the body. Octopuses have a hard beak, which they use to pierce the shells of crustacean prey. The sack-like body is perched atop the head, which has two complex and sensitive eyes, while the mouth is on the underside. The undersides of the arms are covered with suction cups that are very sensitive to touch and taste.
They use their arms to "walk" on seafloor. A ring of eight equally-long arms surround the head. Cephalopoda means “head foot” in Greek, and in this class of organisms, the head and feet are merged. The octopus is a marine mollusk and a member of the class Cephalopoda, more commonly called cephalopods.
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