For now, I’m going to tell facts about octopus, It’s quite many ⊙△⊙
1st fact: Octopuses have three hearts. For us, humans, we only have 1 heart. But, this creature have 3 hearts! Two of the hearts work exclusively to move blood beyond the animal’s gills, while the third keeps circulation flowing for the organs. The organ heart actually stops beating when the octopus swims, explaining the species’ penchant for crawling rather than swimming, which exhausts them.
2nd fact: Octopus is verrryyy old. The oldest known octopus fossil belongs to an animal that lived some 296 million years ago, during the Carboniferous period, it’s about 359.2 to 299 million years ago ( ꒪Д꒪)ノ. Harmon Courage describes it as a “flattened cow patty” or a “globular splat,” but a close examination reveals the tell-tale eight arms and two eyes. Researchers aren’t sure, but possibly there’s an ink sack there, too. In other words, long before life on land had progressed beyond puny pre-dinosaur reptiles, octopuses had already established their shape for the millions of years to come.
3rd fact: The plural of Octopus is not “Octopi”. It is tempting to use “octopi” as the plural of “octopus”, but DON’T DO IT. “Octopi” would be a proper Latin plural, but the word “octopus” has a Greek, rather than a Latin, root. The correct use is to use the word “octopus” to refer to one or several individuals of a single species; use the plural “octopuses” only when talking about multiple species.
4th fact: Aristotle thought octopuses were dumb. In his History of Animals, written in 350 BC, the Greek philosopher wrote that ”The octopus is a stupid creature, for it will approach a man’s hand if it be lowered in the water; but it is neat and thrifty in its habits: that is, it lays up stores in its nest, and, after eating up all that is eatable, it ejects the shells and sheaths of crabs and shell-fish, and the skeletons of little fishes.” After describing a few more quirks of octopus life history–it ejects ink for self-defense, it’s slimy, it can crawl on land–he flippantly signs off, “So much for the mollusca.” However, the big-brained cephalopod, can navigate through mazes, solve problems and remember solutions, and take things apart for fun–they even have distinct personalities.
5th fact: 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. This copper base is more efficient at transporting oxygen then hemoglobin when water temperature is very low and not much oxygen is around. But this system also causes them to be extremely sensitive to changes in acidity. If the surrounding water’s pH dips too low, octopuses can’t circulate enough oxygen. As such, researchers worry about what will happen to the animals as a result of climate change-induced ocean acidification.
6th fact: Octopus ink doesn’t just hide the animal. The ink also physically harms enemies. It contains a compound called tyrosinase, which, in humans, helps to control the production of the natural pigment melanin. But when sprayed in a predator’s eyes, tyrosinase causes a blinding irritation. It also garbles creatures’ sense of smell and taste. The defensive concoction is so potent, in fact, that octopuses that do not escape their own ink cloud can die.
7th fact: Octopus actually have shells similar to clams and snails. There is a pair of small, spike-shaped structures called stylets inside the octopus’ body, called Cephalopods molluscs, that are a vestigial shell—meaning it really has no function.
8th fact: Octopus frequently lose an arm to predators, but they grow back.
9th fact: It’s not a good idea to keep Octopus to be a pet. Due to their skills and ability, problem solving to fit through small space, octopus often escaped from the owner.
10th fact: They are about 90 percent muscle. Cephalopods have the biggest noggins among invertebrates. Squid come equipped with big optic lobes, which help them hone in on prey, for example. Plus, these tentancled swimmers have the largest nerve cells of any animals. Squid are also the speediest marine invertebrates, getting up to more than 25 mph using jet propulsion. After water goes into the squid’s body, it squeezes it out with its strong muscles and propels itself. Octopuses have nine brains and they can be trained to do various tasks.