Sand Piranhas aka Sand Fleas are small crustaceans (Excirolana ... These feisty crustaceans are related to Roly Polys, and burrow in the sand to hide from predators. They're translucent, tiny ...

Another tropical parasite: Tunga penetrans. More commonly known as the sand flea. Females burrow into the bottom of your foot to slurp your blood. They start off smaller than a grain of sand ...