And beavers have teeth reinforced with iron, which makes their front incisors a vivid orange: https://www.mcgill.ca/oss/article/did-you-know/beavers-have-metal-

And beavers have teeth reinforced with iron, which makes their front incisors a vivid orange: https://www.mcgill.ca/oss/article/did-you-know/beavers-have-metal-teeth https://www.mcgill.ca/oss/article/did-you-know/beavers-have-...