Eucalyptus leucoxylon (South Australian Blue Gum)
This is one of those situations where one cannot use the common name for the species. Blue gum is the common name given to a few Eucalypts. The Tasmanian Blue Gum is Eucalyptus globulus. The Victorian Blue Gum is Eucalyptus globulus subspecies bicostata. The Sydney Blue Gum is Eucalyptus saligna.
This photo has Little Wattle Birds in the canopy of the tree. We were visiting a garden and sitting outside having a cuppa watching all this bird activity.