Sand Fiddler Crab (Uca pugilator) at Marine Park. Many little ones are eaten by Yellow-crowned Night Herons.

Handedness in crabs (from Copilot):

“In most fiddler crab species, males have one greatly enlarged claw (the major claw) and one smaller claw (the minor claw), and the side on which the major claw grows is called the crab’s “handedness.”

The myth that losing a major claw causes the crab to “switch” to the other side is false — the crab regenerates a new major claw on the same side, and the small claw stays small

In many species, males are evenly split between right- and left-handed (about 50:50) www.fiddlercrab.info.

The exception is the genus Gelasimus, where males are almost entirely right-handed (often >95%) www.fiddlercrab.info.”