Tens of millions of crabs have started their annual migration on Christmas Island, turning the roads and undergrowth red.   The island, located off mainland Australia and near the Indonesian island of Java, experiences this every summer, when around 50 million of them move from their homes down to the beaches to lay their eggs.   Special crab bridges have been built on the island to help the crabs get around tricky obstacles like roads.   Tap the link in BBCNews’s bio to find out more about their movements.   #Crabs #ChristmasIsland #BBCNews