If you look carefully you can see some of the little black Australian native stingless bees flying around this Grevillea sp. They are probably Trigona sp. There are three in this photo that I can see. How many can you spot? They have a very characteristic jizz, with dangling hind legs which are modified for carrying pollen. The dozen or so species of Australian stingless bees are all tropical but some come down the east coast to south of Sydney.
In recent years it has become rather trendy in suitable areas of Australia for hobby apiarists to keep native bees. They live communally and produce a small quantity of honey, known as 'sugarbag', which can be harvested.