Cephalopod ink

Cephalopod ink is a dark pigment released into water by most species of cephalopod, usually as an escape mechanism. All cephalopods, with the exception of the Nautilidae and the Cirrina (deep-sea octopuses), are able to release ink. A number of other aquatic molluscs have similar responses to attack, including the gastropod clade known as sea hares.

Cephalopod ink

Cephalopod ink is a dark pigment released into water by most species of cephalopod, usually as an escape mechanism. All cephalopods, with the exception of the Nautilidae and the Cirrina (deep-sea octopuses), are able to release ink. A number of other aquatic molluscs have similar responses to attack, including the gastropod clade known as sea hares.