Charlotte Uhlenbroek explores more animal chatter when she dives down into the colourful coral world of the Red Sea. Here fish advertise their identity with their own colour-coded uniform. This is vital for a tiny cleaner fish that makes a living eating parasites off other creatures. Its uniform clearly says, "Don't eat me. I am useful". A midnight dip in the Caribbean reveals tiny marine animals that produce light to communicate. Charlotte also taps into the fishy conversations of a knife-fish who use a sixth sense - electricity - to spark up its chat line for a mate. In Southern Australia, she is enthralled by the kings of costume drama - giant cuttlefish who produce extraordinary zebra bands across their backs to talk to each other. The huge male cuttlefish guards the females, but small males, who would not stand a chance, become transvestites, pretending to be one of the girls, and sneak in, to mate with the female. In the Bahamas, she swims with bottlenose dolphins who know and call each other by name. She also dives with her favourite humpback whales to experience their powerful songs at first hand. Her whole body vibrates as a whale sings. Some whale songs are so loud they can be heard half way around the world. Show less