any of various marine mollusks of the class Cephalopoda,such as the octopus,squid,cuttlefish,or nautilus,having a large head,large eyes,prehensile tentacles,and,in most species,an ink sac containing a dark fluid used for protection or defense

• 头足纲动物，软体动物门的一种海生软体动物，如章鱼、鱿鱼、乌贼或鹦鹉螺，有可缠绕的触须、较大的头和眼，大多数种类都有一个作保护或防卫用的容纳深色液体的内存墨囊