A crab bridge in Christmas Island, Australia, facilitates the safe passage for the migrating red crabs (Photo credit; Wondrous World Images via parksaustralia.gov.au)
In Christmas Island, Australia, signposts alerting passers of animal-crossing don’t suffice; traffic detours, public announcements, and permanent bridges are in need, as the island roads must make way for a sea of crabs to pass by! The spectacular annual event is a natural wonder.