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This summer, please leave the sea shells by the seashore For native wildlife, both occupied and unoccupied shells provide important shelter and sources of calcium and grit. Taking that beautiful snail shell could increase the cost of housing for a hermit crab or the small shrimp that needs it next. The beautiful conch shell that calls to you is actually an octopus caravan. For these reasons, never pick up shells in the water or in tidal pools; chances are they are being used or will be shortly. Likewise, collecting shells in marine parks is strictly prohibited.

https://theconversation.com/this-summer-please-leave-the-sea-shells-by-the-seashore-243157