Angus,
Some nice photos which remind me of why I miss Sydney birds.
Although August is a bit early to be seeing returning waders it is the time for nesting honeyeaters, pardalotes and raptors. Peregrines are nesting along the cliffs on the south and northern beaches of Sydney and Osprey and Sea Eagles on the lakes. The Kuringai Chase National Park (northern side ) is a good place for honeyeaters.
Due to the breaking of the drought inland ( the Outback ) many of the water birds have left Sydney to breed. Last year there were 90 pelicans on Dee Why Lagoon and this year in June only 4 . Many of the ducks have gone too.
I'll be back there in Sydney in October and hopefully will be in time for the peregrine young fledging.
Neil.