![]() They are about 90 percent muscle, and because they lack bones, they can fit through very small spaces. Once they break into the shells, they may also inject a paralyzing poison into its prey. They also have a sharp beak and a toothed tongue called a radula, which they use to pry open and drill into the shells of prey, like crabs and clams. They have no skeletal structure but do possess a skull, which protects their brain. They can grow up to 25 cm (10 inches) in mantle length with arms up to 1 m (3.3 feet) long, and may weigh up to 9 kg (20 pounds). The common octopus has a distinct appearance, with a large bulbous head, large eyes, and eight distinctive arms. The common octopus is considered to be abundant across their range, and are currently listed as Least Concern on the IUCN Red List. They are able to change their color to blend in with their surroundings and can even adjust their shape to escape predators. They hunt at dusk and mostly eat crabs, crayfish, and bivalve molluscs. These animals are quite large, and their tentacles can measure up to 1 m (3.3 feet) long. It is a cosmopolitan species and occurs all over the world, particularly abundant in the Mediterranean Sea, the Eastern Atlantic Ocean, and in Japanese waters. The common octopus is most famous for its eight legs. It is the most studied of all the octopus species. ![]() The common octopus (scientific name: Octopus vulgaris) is a mollusk belonging to the class Cephalopoda, the family Octopodidae and the genus Octopus.
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