Once a year when the rains have arrived on Christmas Island, thousands upon thousands of Red Crabs make their way down the mountain to be close to the beach. There the males dig their burrows and patiently wait for the females to arrive. In some cases these crabs travel over 9km risking death on the roads and sheer exhaustion.
Once they have mated the males return to the jungle and the females wait for the time to travel to the ocean shore to “dip” and release their eggs. This usually happens at dawn on a high tide. Many don’t survive; they drown, washed away by the incoming tide. Once they release their eggs, their journey back to the jungle begins.
David Attenborough’s documentary “Great Migrations” feature the Red Crabs journey.
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