Every year, swarms of Christmas Island red crabs make their annual trek to the sea. Tied to the lunar calendar, the massive migration usually begins during the island's wet season in October or November, when millions of crustaceans travel from the rain forest to seaside breeding grounds to mate.
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Learn more about the Christmas Island Red Crab.
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Millions of Red Crabs Swarm Christmas Island Every Year | Nat Geo Wild
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