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Created By: Short, Rowen

Biology: Octopi are classified as Cephalopoda, along with squids, cuttlefish, and nautila. There are 289 species of Octopi in the world that we know of so far. Octopi have eight limbs, two symmetric eyes, a beak, and a mouth in the middle of the limbs. They also have three hearts, blue blood and a very soft body. The soft body of the Octopi makes it possible for the octopi to alter its shape and mimic other animals or fit into tight spaces to hide from predators. Octopi can even get out of tough situations if needed, likeopen a jar if trapped inside. Octopi use a siphon to propel themselves forward by expelling water with their arms and then having the arms trail behind their bulbous head. Octopi also use the siphon for respiration by forcing water into their gills when propelled forward.

Habitat and Reproduction: They live in coral reefs, ocean beds, and deep sea caverns. To repopulate, the male Octopi uses a special arm called the Hectocotylus. This spoon-shaped third right arm of the octopus is used to propel sperm into the female Octopuses mantle cavity. Sadly though, after sex, the male Octopi dies and forty days later, the mother attaches a string of about 10,000-70,000 fertilised eggs to the sides of a cave or a crevice.

Predators and Defence: Octopi have to worry about fish, birds, eels, sharks, dolphins, and even some whales.<meta charset="utf-8">Octopi are considered to be the most diverse and intelligent invertebrates when it comes to defence. Theyhave three main ways to protect themselves; they can expel ink from their siphons, autotomise their limbs, anduse special skin cells. The special skin cells octopi use are called chromatophores for both color changing and light reflection/refraction. They can use this ability to hide, communicate to other octopuses, or warm other octopi of danger. One example from the World Animal Foundation is the Blue-Ringed Octopus which becomes bright yellow with blue rings when it feels threatened. If the octopus is unable to use it's ink or camouflage, then the crawling arm can be autotomized as a distraction for the predators as the octopus gets away. This same ability is also used during sex after the male octopus has fertilised the females egg, the arm detaches.

Fun Facts: According to Live Science, two thirds of Octopuses neurons are in its arms rather than its head. This means their sense of touch is so incredible that they can taste what they are touching with their suckers. Octopuses can have one arm searching a cave while another is opening a shellfish.