sand hopper
US /ˈsænd ˌhɑː.pər/
UK /ˈsænd ˌhɑː.pər/
1.
a small, shrimp-like crustacean that lives on sandy beaches, typically active at night, feeding on organic debris
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We saw many sand hoppers jumping around on the beach at dusk.
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The presence of sand hoppers indicates a healthy beach ecosystem.