Adult digger wasps (jigabachi) feed on pollen. They also hunt caterpillars, but they use these as food for their young. The adult female digs a burrow in the sand, catches a caterpillar, which she paralyzes using a special poison, and then she drags it into the burrow and lays a single egg on it. When the egg hatches, the larval wasp feeds on the caterpillar and emerges from its burrow the next year.
Insecta: Hymenoptera: Sphecidae
Sand Digger Wasp (jigabachi) = Ammophila sabulosa (22-28mm)