Underwater Auroras - colour wizardry in action! When two male Australian giant cuttlefish meet you can be sure to see some fireworks! Using special skin cells they generate dazzling light displays and patterns to warn other males to stay away. There was a female nearby that these two were fighting over so they had to put on their best colours! Not only can they can change colour in an instant, by raising parts of their skin, they can also change shape and texture to imitate rock, sand or seaweed