"Christmas Island rainforest"Red crabs begin their march from the forest to the sea, where they will reproduce. During the migration, the island's human inhabitants just have to adapt. There are around 120 million crabs on the march The crabs navigate the same pathways year after year For the islanders, encounters with crabs during the migration are just part of island life. Most of the time we just work around the crabs and take them for granted Red crabs are scavengers After two weeks of marching, the first wave of crabs reaches the ocean. The weary travellers dip in the ocean to replace body fluids and salts. The weary travellers dip in the ocean to replace body fluids and salts. Aerial view of Christmas Island. Crabs pop up in the most unexpected places. female crab expels eggs from her brood pouch. The eggs hatch immediately on contact with the water Baby crabs navigate their way into the rainforest.