The name "fiddler crab" comes from the male's distinctive waving motion used to attract mates.
Either the right or left claw is significantly larger, with a roughly equal split between the two.
Females select mates based on both the size of the enlarged claw and the male's performance with it.
They can temporarily seal their burrows to protect themselves from high tides and predators, relying on air trapped inside for breathing.
Their lifespan is relatively short, typically not exceeding two years.
Their diet primarily consists of algae, bacteria, fungus, and detritus scraped off sand particles.
Rather than shedding their shells as they grow, fiddler crabs reabsorb them.