Christmas Island lies far off the shores of Australia in the NW, and is the tip of an extinct volcano. They have the largest number of land crabs in the world and the Red Crab has the largest number in a migration in the world. There are about ten million who live in the rain forest in the centre of the island and once a year make the perilous 5 km journey to the ocean where they mate, The females wait 3 days for incubation in the burrows that the males made in advance of the females arriving. They wait for the Neap tide, when the difference between high and low tide ...