圣诞岛红蟹大迁徙：每年数千万只红蟹从雨林奔向海岸
At the start of the wet season, usually in October or November, a strange red tide sweeps across Christmas Island in the Indian Ocean. It is not water but a flood of land crabs. Over 50 million red crabs leave their burrows in the island’s moist inland forest and begin a perilous march toward the coast. For the small Australian territory, this is the most dramatic natural event of the year, turning roads, cliffs, and gardens into a moving carpet of crimson. Locals and tourists alike stop to watch as the ancient ritual unfolds, timed perfectly with the lunar cycle and the first heavy rains.
The migration is driven by a single purpose: breeding. Male crabs lead the way, followed by females. Their journey can take up to a week, covering distances that for a palm-sized crustacean equal a marathon. They climb down limestone cliffs, cross busy roads through special tunnels and bridges built for them, and gather at the shoreline in numbers so vast that beaches appear to be painted red. Once there, the crabs dip into the sea to replenish their body salts and then mate. The females retreat into the shallow ocean to release millions of eggs, each timed to hatch precisely at high tide, giving the larvae the best chance to survive.
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