Brief description of what you observed
The surf revealed where all the juveniles were hiding. I wonder if all the beachgoers were scaring the shorebirds off thereby allowing the juvenile sand crabs a predator-free morning.
Large female, one of many seen. Some of them had orange eggs.
I've never seen so many Emerita analoga, aka Pacific Sand Crabs, millions of dead shells all along Limantour Beach. I remember digging these up as a kid.
Emerita analoga, the Pacific sand crab or Pacific mole crab, is a species of small, sand-burrowing decapod crustacean found living in the sand along the temperate western coasts of America. It is found on exposed sandy beaches in the swash region of the intertidal zone.