This is a beautiful Australian native bird, which is residing in Canberra, there is no reason not to include it. There are lots of Australian native plants, which have come from other parts of Australia, as well as even more plants that have come from other countries, and these have been included.
Of course, it would be okay to include vagrants or even birds that have escaped, as long as it is seen in the open- It is just that I'm pretty sure this would have been a captive individual pretty much inside its 'cage' (the zoo).
There are about 3 isolated occurrences 100-200kms away of probably released or escaped birds, but closest real occurrences are over 500kms away near melbourne.
Have a look at http://canberrabirds.org.au/wp-content/uploads/2014/12/ACT_annotated_birds_checklist_17Dec14.pdf and http://ebird.org/ebird/australia/map/cabgoo1 for more info.