又称石居、八爪鱼、坐蛸。属于软体动物门,头足纲,八腕目。章鱼广泛分布于世界各地热带及温带海域,中国南北沿海也有分布。肉食性，以瓣鳃类和甲壳类(虾、蟹等)为食，有些种类食浮游生物。
学名：Octopus vulgaris
英文名：Octopus
It belongs to the class of Cephalopoda and also called the fish with eight feet. It is widely distributed in tropical and warm temperate seas around the world and also distributed along the northern and southern coasts of China. It’s carnivorous, feeding with branchial and crustaceans (shrimps, crabs, etc.), while some types of octopus eat plankton.