Christmas Island Red Crab (Gecarcoidea natalis): On Australia’s Christmas Island, tens of millions of red crabs migrate en masse from the forest to the coast to spawn. Triggered by the lunar cycle and monsoon rains, the migration covers several kilometers. Roads are closed, and barriers guide them safely. Males dig burrows, females lay up to 100,000 eggs, which are released into the sea at high tide. Larvae develop offshore before juveniles return inland. Predation by invasive yellow crazy ants has devastated populations. This spectacular event, synchronized with natural rhythms, transforms the island’s landscape and highlights how invasive species can disrupt even the most resilient natural phenomena.
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