Wikipedia on the Christmas Island Red Crab says:
"The Christmas Island red crab, Gecarcoidea natalis, is a species of terrestrial crab endemic to Christmas Island in the Indian Ocean. Although restricted to a relatively small area, it is estimated that up to 120 million red crabs may live there, making it the most abundant of the 14 terrestrial crab species on Christmas Island. Christmas Island red crabs eat mostly fallen leaves and flowers, but will occasionally eat other animals, including other red crabs if the opportunity arises.
Christmas red crabs live in burrows for shelter from the sun. Since they breathe through gills, the possibility of drying out is dangerous. They are famous for their annual migration to the sea to lay their eggs in the ocean. During the migration, the crabs cover highways so densely that they are visible from the air. Volunteers shovel the crabs off the roads and, although no harm is intended, some of the countless millions inevitably get injured."
The only dispute I have is the roads here are not really highways - very few bitumen sections of the roads - nothing more than one lane each way in width.
Great pic! You should enter this in the theme! (include 'theme-signs' in your tags). I love the little crab bottom right who looks like he is the guardian of the road!
