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Holding a Ink-Squirting Octopus at Sea
Does the Octopus Really “Fart” Ink? [Video]
Cephalopod ink is a dark-coloured ink 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. The ink is released from the ink sacs located between the gills and is dispersed more widely when its release is accompanied by a jet of water from the siphon. Its dark colour is caused by its main constituent, melanin. Each species of cephalopod produces slightly differently coloured inks; generally, octopuses produce black ink, squid ink is blue-black, and cuttlefish ink is a shade of brown. A number of other aquatic molluscs have similar responses to attack, including the gastropod clade known as sea hares. Charles Darwin , The Voyage of the Beagle.
Octopuses Octopus spp. They are some of the most fascinating creatures in the sea, found in every ocean in the world, and every continent's coastal waters. The octopus is essentially a mollusk that lacks a shell but has eight arms and three hearts. Where cephalopods are concerned, marine biologists are careful to distinguish between "arms" and "tentacles. By this standard, most octopuses have eight arms and no tentacles, while two other cephalopods, cuttlefish and squids, have eight arms and two tentacles.
It's true that the octopus is super weird. These animals have blue blood and three hearts. And as online personality and humorist Ze Frank points out in his latest video creation, it seems that they can also "fart ink at a moment's notice"—pointing to this as "evolution at its finest. The video's tongue-in-cheek tone might lead you to think that Frank is providing a bit of gross exaggeration. But he's actually basically right about this—and a lot of other things in his recent video creation "True Facts About the Octopus" below. Octopuses do expel ink from their siphons, which are also the openings through which they shoot water for swimming and bodily waste. So although not exactly flatulence, octopuses' ink—used to confuse predators—does emerge from the opening that could be considered its anus.
Cephalopod ink is a dark-coloured ink 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. Octopuses have also been observed squirting ink at snails or crabs approaching.
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Cephalopods, the group of molluscs that includes octopuses, cuttlefish, squids, ammonites, nautiluses and belemnites, are a weird bunch. Despite there only being around living species of cephalopods, biologically, they have evolved an array of adaptations that modern science is still only just unpicking. Neurologically, they are head and shoulders if they had them above all other invertebrate animals, sometimes called honourary vertebrates for their cognitive ability and potential conciousness. They are famed for their ability to change colour, shape and size. Many of them are fast growing but short lived.