This episode features Dotty, a young spotted dolphin who lives in the ocean with her mum in a group called a pod. Being so young, Dotty won't get her spots for another year or so. Through her story, we enter the extraordinary world of dolphins, disocvering that they live in close family groups, chat in clicks and whistles and combine ultrasound with clever teamwork to come up with jaw-dropping strategies to hunt fish. But with great white sharks and tuna fishermen out there, Dotty has to learn fast if she's to survive.