Sandollars are flat invertebrates related to urchins and starfish. They come in vibrant shades of reddish-brown, purple, and pink but turn white when they die. Their hard skeletons and few edible parts make for very few predators.

Known as sand dollars in some countries they're also called sand cakes, sea biscuits, cake urchins, sea cookies, snapper biscuits, and pansy shells.