The Astonishing Annual Red Crab Migration Posted on 20 March 2015 at 22:22 Each year millions of bright red land crabs leave their burrow homes on Australia's Christmas Island and start a long, laborious trek toward the sea. They descend cliffs, climb banks and maneuver around obstacles to reach the shoreline and lay their eggs, eventually returning to the island's central plateau with their offspring in tow. The synchronized migration resembles a crimson-colored river undulating across the island and can last up to 18 days. The event typically takes place in November or December (the crabs will only move when it's raining) and coincides with the turning of high tide and the arrival of the waning moon.
