At the beginning of the wet season on Christmas Island more than 150 million red crabs move from inland shelters to the shore for their annual breeding season. During this time, usually from October to November, the entire forest floor, and even the roads that run through it, are swathed in a sea of red in one of the most spectacular animal migrations in the world.
Red Crab Migration, Christmas Island | Australia At the beginning of the wet season, most adult red crabs suddenly begin a spectacular migration from the forest to the coast to breed. During peak migration times, sections of roads where crabs cross in high numbers may be closed to vehicles for short periods of time. (Photos by Alain Thain, Charlie Summers, and Max Orxard)