National Seashell Day

Many seashells washed up on beaches are empty remains of dead mollusks, but some still contain living animals or other organisms using them as shelter.

Biologists and conservation groups recommend checking carefully and leaving any shell that is occupied, since removing it can kill the animal or displace creatures that depend on it for protection.  

Seashells grow from the mantle, a soft tissue in mollusks that secretes calcium carbonate and organic material along the shell’s edge.

The rate and direction of this growth, controlled by the animal’s genes and local conditions, create coiled or fan‑shaped shells.

Pigments released by the mantle during growth form bands, spots, and other patterns, which can serve as camouflage or species identifiers.  

Research on a Mediterranean beach in Spain found that heavy tourism was linked to a 60–70% decline in shells on the sand, raising concerns about lost habitat for small animals and possible effects on beach stability.

Empty shells provide shelter, attachment surfaces, and a source of calcium carbonate as they break down, so conservation educators often advise minimizing collection, avoiding busy or protected sites, and following local rules. 

Responsible shell collecting typically means never taking live animals, leaving occupied shells in place, limiting the number of empty shells taken, and respecting protected areas where collecting is restricted or banned.

Conservation organizations also suggest choosing photography and beach cleanups over souvenir gathering, and avoiding crafts or jewelry that use shells of unknown origin.  

Archaeological and historical studies show that shells have served as trade goods, ritual objects, tools, and even forms of currency.

In the Americas, marine shells such as Spondylus were transported long distances and crafted into high‑status items, while in other parts of the world cowries and similar shells functioned as money and symbols of wealth and power.

Ethnobotanical and historical medical texts describe seashells being ground or processed for remedies and toiletries, especially in Europe and Latin America.

Powdered shell, mother‑of‑pearl, and cuttlebone were used in tooth powders, as absorbents in dermatological treatments, and in mixtures aimed at easing digestive problems and skin conditions, reflecting both their mineral content and symbolic value.  

In the American Southeast, mollusk shells accumulated in large mounds over thousands of years, reflecting their importance as food sources and materials for tools, ornaments, and ritual objects.

Museum and humanities research shows that shells there are intertwined with Indigenous history, trade, and spiritual life, making them key to understanding long‑term relationships between people and coastal environments.