I can't confirm you the reason but I know that they are the largest arthropod that lives in land in the World. Imprevise, right?
coconut crab is the largest land living arthropod in the world, and is probably at the upper size limit for terrestrial animals with exoskeletons in recent times.
I just love the beach do you know anything about it's coral reefs? Unfortunatelly I don't know anything about coral reefs, all I know is that beaches are composed by particles made from rock, like gravel, sand, pebbles and others Where do those materials come from?  Are they washed up from the ocean? I am not sure about where they are from but I know that they can have a biological origin also, like mollusc shells Do any animals live on the beach? I am not sure about that either. But I know something interesting: Beaches occur in areas where the sediments are deposited and reworked by current or wave action I just love to eat crabs for dinner.  I wonder what attracts them to the area.
It is the largest land-living arthropod in the world, and is probably at the upper size limit for terrestrial animals with exoskeletons in recent times, with a weight of up to .