Australian giant cuttlefish have special skin cells called chromatophores that allow them to change the colour of their skin at will. This male cuttlefish has spotted a female behind me, and is signalling for her to follow him to his den by turning his skin purple. She accepted the invitation and mated together there! Cabbage Tree Bay, Sydney! #ocean #wildlife #australia #cuttlefish #giantcuttlefish #cabbagetreebay #freediving #snorkelling #cephalapod #marinebiology #scubadiving #sea #gopro #sepiaapama