This is SeaTalk: Ocean News from the University of Delaware.

Those flashes you see moving across the beach aren’t phantoms — they are fleet-footed animals called ghost crabs. These sand-colored crabs leave their beach dens along the Delaware coast between dusk and dawn to scurry down to the water. There, they feed on smaller animals at the surf's edge and wet their gills so they can breathe. Then they race back to their burrows, which can extend as far as 4 feet into the sand, keeping them safe and cool during hot summer days. Look quickly — their coloring provides great camouflage and they can move at speeds up to 10 miles per hour! This is SeaTalk, a public service announcement from the University of Delaware, the Delaware Sea Grant College Program, and this station.