https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/4024921
Sea Shells Sand dollar.
The term sand dollar (or sea cookie or snapper biscuit in New Zealand, or pansy shell in South Africa) refers to species of extremely flattened, burrowing sea urchins belonging to the order Clypeasteroida. Some species within the order, not quite as flat, are known as sea biscuits. Related animals include the sea cucumbers and starfish. Original public domain image from Flickr
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