The octopus (in English: Octopus), (scientific name: Octopus vulgaris) is one of the widespread marine animals, and its name comes from the Greek word (októpus), which means eight legs (not called tentacles as it is commonly known), which is the number of octopus legs that do not contain their bodies. Bones. The octopus lives only in salt water, and is found in all oceans of the world. It can live at depths of up to 2000 metres, and its most common habitation areas are at the bottom of the ocean and among coral reefs. The octopus tends to find a new nest or place to live every 10-14 days, and it is able to live in different water temperatures. The octopus belongs to the group of molluscs, the order of cephalopods, and is characterized by a prominent head, a mouth surrounded by eight arms containing simple suckers, and a soft body that does not contain a skeleton. This enables it to squeeze its body and hide in narrow crev
ices, as the only solid part that the octopus has is the beak-like jaw in its mouth. The octopus has 3 hearts; The first's function is to pump blood to different parts of the body, while the second and third hearts pump blood to the gills so that it can breathe underwater by collecting oxygen. The octopus is also distinguished by the blue color of its blood. This is because his blood contains the copper-rich protein hemocyanin instead of hemoglobin. There are more than 300 different species of octopus in the world's seas.