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They perform their famous backward swim by blasting water through a muscular tube on their body called a siphon. They also crawl along the ocean’s floor, tucking their arms into small openings to search for food.

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Although octopuses are not considered endangered, they do face dangers from human activity. Such threats include habitat destruction, and a reduction in their main foods due to over fishing and marine pollution.

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For the most part, octopuses are solitary creatures and live alone in dens made from rocks. And check this out – they build their dens themselves by moving the rocks into place with their powerful arms.

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As well as for camouflage, these incredible invertebrates use colour change as a way to communicate with other octopuses

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These cool critters live in all the world’s oceans, but they’re especially abundant in warm, tropical waters.

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Octopuses have blue blood. To survive in the deep ocean, octopuses evolved a copper rather than iron-based blood called hemocyanin, which turns its blood blue.

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Octopus ink doesn’t just hide the animal. The ink also physically harms enemies. When sprayed in a predator’s eyes, tyrosinase causes a blinding irritation.

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Octopuses have very good eyesight and an excellent sense of touch

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An octopus's main defence against predators such as sharks is to hide and camouflage itself by using certain skin cells to change its color. This can also be used to talk with or warn other octopuses.

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Octopuses are believed to be highly intelligent compared to other invertebrates

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Very little is really known about the mimic octopus and how their numbers may have fluctuated over time. Given that they often live in marine areas near river mouths, it can be assumed that chemicals released into the water system pose a risk to their numbers in the same way as it would to all marine life in such an area. However there is currently insufficient data on how populations thrive or suffer under different conditions.

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The largest octopus is believed to be the giant Pacific octopus, Enteroctopus dofleini which weigh about 15 kg (33 lb), and has an arm span up to 4.3 m (14 ft).

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Being a fleshy creature with no bones, no spines and no poison, this makes the mimic octopus a very interesting proposal to anything in the sea with teeth and a stomach. In the estuarine conditions that mimics favour this may mean fish including small sharks and barracuda. Therefore it is believed that the mimicry is the form of defence that this octopus has evolved.

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Octopuses are waaay old. The oldest known octopus fossil belongs to an animal that lived some 296 million years ago, during the Carboniferous period.
Read more: https://www.smithsonianmag.com/science-nature/ten-curious-facts-about-octopuses-7625828/#RPTPamG3LMssXlpc.99
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Octopuses have three hearts

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An octopus has a hard beak, like a  parrot beak, which they use to break into and eat their pray such as crabs and shellfish

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Octopuses can squeeze into tight spaces as they are invertebrates which means they have no skeleton, (some species have a protective casing in their mantles).

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As with all octopus, the mimic has 8 arms, a mantle containing 3 hearts and other internal organs, and a siphon used for jet propulsion. The arms have 2 rows of suckers, each sucker having a touch sensor and a chemoreceptor, allowing the mimic effectively to feel and taste its food before it eats it. It has a large brain but lacks the sense of hearing.

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Octopuses have two eyes in a globe-shaped head (mantle) off which protrude eight long limbs called tentacles that have two rows of sucker senses.

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They have the largest, most complex brain of any invertebrate animalson Earth." These complex brains allow octopuses to process information and make decisions about which tricks to deploy to escape predation (or an aquarium).

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There are around 300 species of octopus, usually located in tropical and temperate ocean waters. They are divided into finned deep-sea varieties that live on the ocean floor and finless, shallow water varieties found around coral reefs.

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Mimics are normally quite small, growing only up to 60 cm (2 feet) long and have a body covered with brown and white stripes or spots, although in a resting state their body colour is more of a pale brown or beige. Their tentacles are around 25 cm in length and no more than pencil thick.

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Mimics either stalk their prey or can be seen foraging over an area of sand, probing into holes using the tips of their fine arms to flush small crustaceans and fish into its suckers, and from there into its mouth.

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Underwater, octopuses have keen eyesight, but even after climbing out of a tank, they can use the suckers on their arms for touch and taste, as well as for suction