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Red crabs begin their march from the forest to the sea, where they will reproduce
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A female crab expels eggs from her brood pouch
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After two weeks of marching, the first wave of crabs reaches the ocean
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The weary travellers dip in the ocean to replace body fluids and salts
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There are around 120 million crabs on the march
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Red crabs are scavengers
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During the migration, the island's human inhabitants just have to adapt
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Aerial view of Christmas Island
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Location of Christmas Island
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Christmas Island rainforest
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Baby crabs navigate their way into the rainforest ... and the ants
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The crabs navigate the same pathways year after year
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The eggs hatch immediately on contact with the water
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Red Crab Video
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