Tracking sharks

This month we submerge ourselves in the science of tracking sharks. How do we follow them, where do they go, and what do they get up to when we're not watching? We catch up with Ecocean's Brad Norman to find out how he was inspired by the stars to help track the biggest fish in the seas. Mahmood Shivji from the Guy Harvey Research Institute tells us about how cutting edge genetic tools are helping to track the trade in sharks fins. And Boris Worm chooses our Critter of the Month.