Australia's Christmas Island in the early 1900s was accidentally invaded by yellow crazy ants arriving in cargo shipments, but the insects went on to kill more than 15 million red crabs, allowing rainforest trees to decline and permanently reshaping the island's forests

For decades, Christmas Island has been known for a remarkable wildlife event. Every year, millions of red crabs leave the forests of Christmas Island and head to the ocean to mate, forming a vivid red carpet on streets, beaches, and forest paths.

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