They are fascinating creatures to watch. Not only can they change the colour pattern of the skin but also its texture. As adults they can reach a metre in length and live for about 2 years. It has been recently discovered that they aggregate in very large numbers to breed in the Spencer Gulf in South Australia. The one in the picture is only about 15cm long.
This last photo is of a juvenile Southern Pygmy squid (a close relative to cuttlefish), only a day after it hatched. It is only 1 cm long and this is a picture showing it starting to display different patterns with its chromataphores.....I call it "First Words".