Jaw-Dropping: The Most Expensive Bridge Projects in the World

8. A Bridge Made of Crabs

Christmas Island Red Crab Migration Location: Cocos Islands and Christmas Island, Australia

Founded: Unknown

Cost: Not specified

The Cocos Islands and Christmas Island, located in the Indian Ocean, are renowned for their unique inhabitant, the Christmas Island red crab. Each year, these remarkable crabs embark on a spectacular journey, leaving their homes in large groups to migrate across the islands. This mass movement creates an extraordinary sight, often described as a "crimson sea" as the vibrant red crabs traverse the landscape.

Advertisement

The residents of the Cocos Islands and Christmas Island made the decision to assist the crabs. Crab bridges and tunnels have been built on the island to help the crabs travel the dangerous distance across the island more securely. Public sign boards prohibit humans from utilizing these bridges, which are used by millions of red crabs.