The shape of flippers may help with the efficiency of wind turbines, thanks to humpback whales. Bumps on the edge of their flippers assist them, as they power through water. Biologist Frank Fish discovered this when he saw a sculpture.

With Patrick Aryee. For more information and animations: www.bbcworldservice.com/30animalsPlease leave rating and reviews and help us to spread the word.#30Animals