I found some of these molluscs on the beach in Agulhas today. They’re called Chitons and they’re rather cool:
And why are they so cool? Well, because they have metal teeth. And they don’t just use them for eating with:
Chitons have radular teeth made of magnetite (an iron compound) making them unique among animals. This means they have an exceptionally abrasive tongue with which to scrape algae from rocks. The iron crystals may also be involved in magnetoception, the ability to sense the polarity or the inclination of the Earth’s magnetic field, and thus may be used in navigation.
Pretty cool, hey?
Told you so.