Editing Squid (section)

===Predator distraction with ink===
[[File:Loligosepia aalensis 01.jpg|thumb|Fossil ''Loligosepia aalensis'' from the lower Jurassic; the [[ink sac]] is still full of black eu[[melanin]] pigment.]]

Squid distract attacking predators by ejecting a cloud of [[Cephalopod ink|ink]], giving themselves an opportunity to escape.{{sfn|Cott|1940|p=381}}<ref name=Derby>{{cite journal |last1=Derby |first1=Charles D. |title=Escape by Inking and Secreting: Marine Molluscs Avoid Predators Through a Rich Array of Chemicals and Mechanisms |journal=The Biological Bulletin |date=December 2007 |volume=213 |issue=3 |pages=274–289 |doi=10.2307/25066645 |pmid=18083967 |jstor=25066645|s2cid=9539618 }}</ref> The ink gland and its associated ink sac empties into the rectum close to the anus, allowing the squid to rapidly discharge black ink into the mantle cavity and surrounding water.<ref name=Hanlon>{{cite book|author1=Hanlon, Roger T. |author2=Messenger, John B. |title=Cephalopod Behaviour|url=https://books.google.com/books?id=Nxfv6xZZ6WYC&pg=PA25 |year=1998 |publisher=Cambridge University Press|isbn=978-0-521-64583-6 |pages=25–26}}</ref> The ink is a suspension of [[melanin]] particles and quickly disperses to form a dark cloud that obscures the escape manoeuvres of the squid. Predatory fish may also be deterred by the alkaloid nature of the discharge which may interfere with their [[chemoreceptor]]s.<ref name=Ruppert/>