Christmas Island is home to the famous Christmas Island Red Crab migration. The red crabs play an important role in the island's ecosystem by eating vegetation and recycling nutrients. Their annual migration involves over 100 million crabs moving to the ocean to breed, lasting up to 18 days. To prevent road deaths during this time, wildlife crossings have been constructed under roads for the crabs to safely pass. Conservation efforts like road closures help further protect the unique red crab migration.