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.
