Keyhole Sand Dollar

Also known as Five-holed Sand Dollar, Keyhole Urchin

Keyhole sand dollars are flat, disc-shaped echinoderms easily recognized by the five oblong perforations, or lunules, piercing their skeletons. They live just beneath the surface of shallow, sandy coastal waters, using thousands of tiny, hair-like spines to burrow and channel microscopic food toward their central mouths. When flipped by strong waves, these resilient creatures sense the water currents and use their spines to slowly right themselves back into the sand.