Scientists studying the sperm whales that live around the Caribbean island of Dominica have described the basic elements of how they might be talking to each other for the first time. They hope the research could one day help better protect them. Like many whales and dolphins, sperm whales are highly social mammals and communicate by squeezing air through their respiratory systems to make strings of rapid clicks that can sound like an extremely loud zipper underwater. The clicks are also used as a form of echolocation to help them track their prey. Scientists have been trying for decades to un…