Question

where do octopus get the blue ink from​

Answer 1

Answer:

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.

Answer 2

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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.