سخت پوستان کوچکی که در ساحل زندگی می کنند، شن و ماسه های بزرگی هستند که سواحل کالیفرنیا را شکل می دهند

Tiny beach-dwelling crustaceans are big-time sand movers, shaping the California coast

Stand on the damp sand on a California beach and chances are you're standing on top of an active earthworks site. Sand hoppers (Megalorchestia spp.), the tiny, shrimp-like creatures commonly found eating away at kelp on the shore, have been found to move massive amounts of sand, excavating up to 50 kg (110 pounds) of sand per meter (3.3 feet) of shoreline per day.