Soldier crabs aren't that common near civilzation these days.
Their swarms appear to be smaller, a couple of hundred
instead of thousands; and the individuals are a lot smaller.
This one is about 15mm instead of 25mm
and he was one of the biggest of the bunch.
When they realise they can't outrun you they hide by burying
themselves in the sand. They do this by scooping the sand out from
underneath them and rolling it up into little balls while rotating clockwise.
A sand igloo quickly covers them, and because the sand's wet it blends together.
Several seconds later you can't tell where they burrowed in.
