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Komodo dragons have iron-coated teeth, scientists find | Reptiles | The Guardian
(amp.theguardian.com)
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They aren't the only ones. Beavers do too! So does the Giant Pacific chiton (world's largest chiton, a type of mollusk).
Pretty useful for animals that have to scrape food off rocks or continually gnaw through something.
I guess Komodo dragons need those teeth to last, whereas sharks are just like "I got a million of these things."
And bloodworms have copper teeth! I guess they get it from the sediments they live in. That blew my mind, so finding this out about reptiles is so wild.