There are lots of sand digger wasps in this area. They dig burrows in the sand and store caterpillars (and other insects) as food for their grubs. They are extremely strong and I’ve seen them carrying huge caterpillars.

Insecta: Hymenoptera: Sphecidae
Sand Digger Wasp (jigabachi) = Ammophila sabulosa (22-28mm)

Sand Digger WaspSand Digger WaspSandy area