The term 'cuttlefish defense' refers to the ability of cuttlefish to use their INK as a form of defense. Cuttlefish are cephalopods, meaning they have a distinct head and foot, and they are related to squid and octopuses. When threatened, cuttlefish can release a dark INK-like substance from their bodies, which can be used to confuse predators and create a distraction. This INK is also known as sepia, and it is used in many art forms.