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 red crabs smother a tree. (Photo: James D. Morgan)

Christmas Island red crabs smother a tree. (Photo: James D. Morgan)

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.

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.

Christmas Island, Indian Ocean

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Robber crab with a bunch of red crabs, Christmas Island

Robber crab with a bunch of red crabs, Christmas Island

Albert the robber crab, Christmas Island

Albert the robber crab, Christmas Island

Another robber crab at the house, Christmas Island

Another robber crab at the house, Christmas Island

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