Golden Orb Weaving Spiders are large spiders with silvery-grey to plum coloured bodies and brown-black, often yellow banded legs. The males are tiny and red-brown to brown in colour. The main difference between the common Sydney species, Nephila plumipes and N. edulis (which is commoner in inland regions) is the presence of a 'knob' on the front of the sternum (the heart shaped plate on the underside of the body between the legs) of N. plumipes...Golden Orb Weaving Spiders are found in dry open forest and woodlands, coastal sand dune shrubland and mangrove habitats, with Nephila edulis and N. plumipes being the two species found in the Sydney region. In Sydney, the bushes and trees of the Royal Botanic Gardens are a good place to see them, as are the mangrove forests of Bicentennial Park and the Homebush Bay area of the city.
Information source: http://australianmuseum.net.au/Golden-Orb-Weaving-Spiders