Narwhals: new footage reveals possible purpose for mysterious tusk – video

Drone footage in Canada captures the behaviour of rarely-seen narwhals which appear to use their long tusks to tap and stun fish, making them easier to catch. Narwhals, a type of whale, live in remote locations, meaning very little is known about them. WWF and Fisheries and Oceans Canada have been working together to monitor the creature to better protect it from industrial development