Shell Beach, in Western Australia’s Shark Bay, has a unique composition, consisting almost entirely of the white shells of Fragum erugatum, a species of cockle (a bivalve). This cockle thrives here because its predators cannot cope with the high salinity of the seawater. On the foreshore of Shell Beach, the layer of shells reaches a depth of 8–9 m and also forms the sea floor, stretching for hundreds of yards from the shoreline.
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… well, maybe I can make time to go to WA after all.