Which animal has the largest tooth in the entire animal kingdom? The first animal that might come to mind is perhaps a tiger or lion, and they do indeed have an impressively and intimidating set of teeth! But the animal that hands-down wins this category may surprise you: it is the beautiful, mysterious “Unicorn of the Sea”: the Narwhal! #FunFact: The Narwhal’s Famed Horn is Actually a Tooth --And growing up to an incredible 10 feet long, the narwhal’s tooth easily wins Large