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Do squids squirt ink?
Question Date: 2019-03-08
Answer 1:

Squid, octopuses, and cuttlefish are all in the class of animals called “cephalopods”. These animals can squirt ink to distract their predators and run away. Squid have a muscular sac of ink under their bellies that contains mostly pure melanin. Melanin is the same thing that gives our skin its color! It also contains some stuff that can stop the predator's smell and taste for a little while so that they can’t find the squid after it escapes. When threatened by a predator, they release a large cloud of thick ink and flee. Also, squid also have the ability to change to a darker color while inking, making them even more invisible. Cool!

Answer 2:

Squids squirt something called ink that mostly has melanin [the chemical that makes skin brown] and mucus ['snot'].

The following link will take you to answers on the ScienceLine database. Please focus on Answer #3: here.

Another interesting link for you to read is below:
cephalopods and ink.

Answer 3:

Yes. As discussed elsewhere on ScienceLine, this is a response by many cephalopods (one of those answers claims "all", but the set does not include Nautilidae or Cirrina) to a perceived predation attempt. Although the "smokescreen" cloud-type inking is perhaps most familiar, some squid can alter the amount, direction, and speed of the ink to produce different effects ( scientific articles here and [Section 5] here; if paywalled, also here) . For example, some produce what are known as pseudomorph clouds. These are believed to be attempts at creating shapes which look like cephalopods which might confuse the predator.

The ink produced by squid is not the same as the ink used for writing with pens and printing. Cephalopod ink is a mixture of two secretions, one providing the coloring and the other being a sort of thick mucus [Section 4].

The colored ink portion is darkened by melanin (the same compounds that gives color to the skin, hair, and eyes of humans), while also containing various other proteins and enzymes. On the other hand, pen and print inks are composed of a colorant and a carrier fluid (and a number of other ingredients which modify the drying, permanence, wetting characteristics, etc., of the ink); the fluid evaporates after writing/printing, leaving only the colorant.

Colorants used in inks span a range of organic and inorganic compounds, from simple suspensions of carbon (to make black) to complex compounds like substituted triphenylmethanes (blues and purples).

Answer 4:

Yes, squid have ink and will squirt it if alarmed.

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