At the beginning of the wet season on Christmas Island more than 150 million red crabs move from inland shelters to the shore for their annual breeding season. During this time, usually from October to November, the entire forest floor, and even the roads that run through it, are swathed in a sea of red in one of the most spectacular animal migrations in the world.

At the beginning of the wet season on Christmas Island more than 150 million red crabs move from inland shelters to the shore for their annual breeding season. During this time, usually from October to November, the entire forest floor, and even the roads that run through it, are swathed in a sea of red in one of the most spectacular animal migrations in the world.

Red crab migration | Christmas Island National Park - crabs climb down cliff to reach the sea.

Red crab migration | Christmas Island National Park - crabs climb down cliff to reach the sea.

Christmas Island: Annually the Christmas Island crabs take an epic trek from rain forest to coast to mate. A month later their surviving babies (5 millimeters long) crawl onto shore and begin climbing inland.

Christmas Island: Annually the Christmas Island crabs take an epic trek from rain forest to coast to mate. A month later their surviving babies (5 millimeters long) crawl onto shore and begin climbing inland.

Christmas Island’s Red Crabs: Each year an estimated 43 million land crabs migrate to lay their eggs in the ocean. | 30 Natural Phenomena You Won’t Believe Actually Exist

Christmas Island’s Red Crabs: Each year an estimated 43 million land crabs migrate to lay their eggs in the ocean. | 30 Natural Phenomena You Won’t Believe Actually Exist

And as terrifying as it looks, the Christmas Island locals consider millions of crabs taking over their homes completely normal.

And as terrifying as it looks, the Christmas Island locals consider millions of crabs taking over their homes completely normal.

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