Last Tuesday night Dave Basset and Brian Jones explained the techniques of bird photography and showed series of impressive images from in and around Canberra. Many of them were from the inner-city Jerrabomberra Wetlands. Here is a map so you can explore the opportunities:
You will need to click on it to view it full size and read the details.
Also, for those who might be contemplating such lenses, here is a link to a review just posted from Photography Life comparing Nikon 200-500mm vs Tamron 150-600mm vs Sigma 150-600mm.