The Christmas Island red crab is a species of land crab native to Christmas Island, an Australian territory in the Indian Ocean. These crabs are known for their vibrant red color and can grow up to 11 centimeters in width. They are famous for their annual migration from the forest to the sea to breed, which can involve millions of crabs moving across the island. These crabs primarily feed on fallen leaves, fruits, and other organic matter, playing a crucial role in the island's ecosystem. Their migration is timed with the rainy season, ensuring that their eggs are released into the ocean during optimal conditions for survival.