CaptionA group of narwhal whales. Tusks of the narwhal whale were once sold as unicorn horns and were immensely valuable. Today narwhal ivory can still fetch large sums and the whales are legally hunted by some Inuit groups. The replacement of traditional weapons by rifles has resulted in many more narwhal being killed or wounded than being retrieved. Hunters have to get near enough to the edge of the ice to retrieve the narwhal with a grappling hook. Figures vary, but it is estimated that from 30 percent to 70 percent of those shot are lost.