So the traditional outdoor Nativity scene unveiled on Christmas Eve next to a giant illuminated Christmas tree in St Peter's Square has been paid for not by the Holy See but by the taxpayers of one of Italy's poorest regions, Basilicata, in the heel of Italy.
Though many invasive aliens are notorious for the harm they bring (pythons in Florida, cane toads in Australia, brown tree snakes in Guam), many others enhance the local nature scene.