<P> An ink sac is an anatomical feature that is found in many cephalopod mollusks used to produce the defensive cephalopod ink . With the exception of nocturnal and very deep water cephalopods , all coeloids ( squid , octopus and cuttlefish ) which dwell in light conditions have an ink sac , which can be used to expel a cloud of dark ink in order to confuse predators . </P>
<P> An ink sac is an anatomical feature that is found in many cephalopod mollusks used to produce the defensive cephalopod ink . With the exception of nocturnal and very deep water cephalopods , all coeloids ( squid , octopus and cuttlefish ) which dwell in light conditions have an ink sac , which can be used to expel a cloud of dark ink in order to confuse predators . </P>
ink glands in cephalopods are used mainly for
ink glands in cephalopods are used mainly for
to confuse predators
to confuse predators