The result of recent rain?

It could have been, but no. This Coconut Crab (Birgus  latro) is the largest terrestrial arthropod in the world. It is  known for its ability to crack coconuts with its strong pincers in  order to eat the contents. It  is sometimes called the robber crab because some coconut  crabs are rumored to steal shiny items such as pots and silverware  from houses and tents. The photo (sent in by Sheil) gives you a good idea of how large these crabs are. If you find one near your rubbish bin, you're on the wrong continent, as these edible monsters are native to Australia...