Warty Bobtail Squid

Found buried in the sand, on muck bottoms with just their eyes showing, in bays and fiords of the oceans, often at great depths. These squid have a glue gland on their backs, so they can cover themselves in sand for camouflage. There is also a light organ in their bellies, that hosts bioluminescent bacteria which produces the iridescent colours.
They feed nocturnally on small crustaceans, fish and smaller squid.

Some of the smallest squids, they can change colour when predators come near.