Yes there is safety in numbers individual spitfires are more readily eaten by birds, but a wriggling mass, oozing smelly eucalyptus sap is very uninviting to predators. They separate and feed at night. They collect the eucalyptus oil from the leaves they eat and it is stored in a special sac. The Gang Gang Cockatoo has learnt to extract and discard the sac and loves nothing better than to munch on a mass of wringers such as those photographed.