This prehistoric snail-octopus-cuttlefish called an Ammonite came in sizes as small as 20 mm wide to as large as 8 feet across! How do we know that about a species that's as old as the planet? Their fossilized shells! They weren't just for decoration. The Ammonite shell protected them, kept them afloat in water, and stuck around to teach us more about an extinct species. Neat, right? Now you have a coin to remember them by.

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