A tourist takes photos of migrating red crabs in Christmas Island, Australia, on Dec. 26, 2013. Recently, millions of red crabs began their annual migrations from the rainforest on Christmas Island in the Indean Ocean to the sea coast to breed. Local government closed most of the roads during the migrations, which normally requires at least a week. (Xinhua/Xu Yanyan)

Tourists walk past migrating red crabs in Christmas Island, Australia, on Dec. 26, 2013. Recently, millions of red crabs began their annual migrations from the rainforest on Christmas Island in the Indean Ocean to the sea coast to breed. Local government closed most of the roads during the migrations, which normally requires at least a week. (Xinhua/Xu Yanyan)

Migrating red crabs are seen in Christmas Island, Australia, on Dec. 26, 2013. Recently, millions of red crabs began their annual migrations from the rainforest on Christmas Island in the Indean Ocean to the sea coast to breed. Local government closed most of the roads during the migrations, which normally requires at least a week. (Xinhua/Xu Yanyan)

Migrating red crabs are seen in Christmas Island, Australia, on Dec. 26, 2013. Recently, millions of red crabs began their annual migrations from the rainforest on Christmas Island in the Indean Ocean to the sea coast to breed. Local government closed most of the roads during the migrations, which normally requires at least a week. (Xinhua/Xu Yanyan)

Migrating red crabs are seen in Christmas Island, Australia, on Dec. 27, 2013. Recently, millions of red crabs began their annual migrations from the rainforest on Christmas Island in the Indean Ocean to the sea coast to breed. Local government closed most of the roads during the migrations, which normally requires at least a week. (Xinhua/Xu Yanyan)

A migrating red crab is seen in Christmas Island, Australia, on Dec. 27, 2013. Recently, millions of red crabs began their annual migrations from the rainforest on Christmas Island in the Indean Ocean to the sea coast to breed. Local government closed most of the roads during the migrations, which normally requires at least a week. (Xinhua/Xu Yanyan)

A staff member of national park inspect migrating red crabs in Christmas Island, Australia, on Dec. 28, 2013. Recently, millions of red crabs began their annual migrations from the rainforest on Christmas Island in the Indean Ocean to the sea coast to breed. Local government closed most of the roads during the migrations, which normally requires at least a week. (Xinhua/Xu Yanyan)

A migrating red crab is seen in Christmas Island, Australia, on Dec. 27, 2013. Recently, millions of red crabs began their annual migrations from the rainforest on Christmas Island in the Indean Ocean to the sea coast to breed. Local government closed most of the roads during the migrations, which normally requires at least a week. (Xinhua/Xu Yanyan)

Migrating red crabs are seen in Christmas Island, Australia, on Dec. 27, 2013. Recently, millions of red crabs began their annual migrations from the rainforest on Christmas Island in the Indean Ocean to the sea coast to breed. Local government closed most of the roads during the migrations, which normally requires at least a week. (Xinhua/Xu Yanyan)

A tourist walks past migrating red crabs in Christmas Island, Australia, on Dec. 28, 2013. Recently, millions of red crabs began their annual migrations from the rainforest on Christmas Island in the Indean Ocean to the sea coast to breed. Local government closed most of the roads during the migrations, which normally requires at least a week. (Xinhua/Xu Yanyan)

Migrating red crabs are seen in Christmas Island, Australia, on Dec. 26, 2013. Recently, millions of red crabs began their annual migrations from the rainforest on Christmas Island in the Indean Ocean to the sea coast to breed. Local government closed most of the roads during the migrations, which normally requires at least a week. (Xinhua/Xu Yanyan)