Brian Cox and Robin Ince find out about the apex predators of the ocean. They are joined by physiological ecologist Lucy Hawkes, shark scientist Isla Hodgson and naturalist Steve Backshall. They learn about the surprising social behaviours of sharks, how they reproduce and exactly how long they have been around for - they’re even older than dinosaurs! Brian and Robin hear about Steve’s experience of diving with over 100 species of shark. Is their reputation as cold blooded killers accurate? New episodes are released on Saturdays. If you're in the UK, listen to the full series first on BBC Sounds: bbc.in/3K3JzyFProducer: Caroline Steel Executive Producer: Alexandra Feachem