Living sand dollars come in a wide range of colors, from green to red and even purple. Adults typically grow from 3-4 inches in diameter.
When the waters are calm, sand dollars will orient themselves upright and bury themselves halfway out of the sand.
They can easily catch tiny, free-floating organisms such as larvae, algae, and diatoms in this position. Sand dollars are omnivorous.
Sand dollars typically live to be around 10 years old, and we can determine their age by the number of rings they have on their exoskeleton.