Tiny, shrimp-like creatures known as sand hoppers (Megalorchestia spp.) are significantly reshaping the California coastline through their daily digging activities, according to a study published in the Journal of Geophysical Research: Earth Surface. Led by marine scientist David Hubbard from the University of California, Santa Barbara, the research found that these small crustaceans can move up to 50 kilograms (110 pounds) of sand per meter (3.3 feet) of shoreline each day. This level of sand movement, known as bioturbation, is among the highest recorded for any living organism on Earth. Sand hoppers are commonly found along the shore, feeding on kelp and other organic matter. They burrow into the sand, typically between 10–30 centimeters (4–12 inches) deep, or take shelter under washed-up seaweed. They are most active at night, searching for sand with the ideal moisture content for their burrows. The study was conducted at Isla Vista Beach, a bluff-backed stretch near the UCSB campus, where the sand hoppers are abundant. To measure the sand hoppers' impact, researchers used metal frames to mark sections of the beach where the crustaceans typically burrow. These areas are referred to as the "Goldilocks sweet spot," where sand is just moist enough to support stable burrows. After waiting overnight, the team discovered that the sand hoppers had moved so much sand that some of the frames were entirely buried. They had to use flags as reference points to assess the extent of the movement. The study highlights the significant role sand hoppers play in shaping coastal environments. Their burrowing not only mixes nutrients into deeper sand layers but also aerates the sediment, allowing oxygen to reach microbial life below the surface. This activity can also increase the susceptibility of sand to erosion, potentially influencing the formation of coastal features like sand dunes. When extrapolated across 25 kilometers (15.5 miles) of Southern California coastline, the amount of sand moved by these tiny creatures is comparable to the daily sediment transport of major Southern California rivers and the natural movement of sand along the intertidal zone. The findings challenge the common perception that animal-driven sediment transport is minor or localized, emphasizing the need to consider such biological processes in coastal management and environmental studies.