We've all heard that whales and dolphins have a highly developed way of making sounds to communicate with each. However when it come to ordinary fish you'd have thought they're pretty silent things. But you'd be wrong. Marine biologist Erica Staaterman from the University of Miami believes that most animals in the ocean including crabs, lobsters, shrimp and fish make sounds. In a new study she shows, for the first time, that 30 day old baby gray snapper fish speak to each other in order to stick together in the sea. Hannah Critchlow's been hearing from Erica, and her little snappers, over... Like this podcast? Please help us by supporting the Naked Scientists