You just need to be in a spot where the "locals" are very people friendly. The Lorikeets on the east coast make very easy (and colourful) photo targets, like 70-200 territory.
Here's a couple of ones with the Sigma 120-300 OS. The first one is the full sized frame of this posted crop.
Rainbow Lorikeet juvenile by duffohyeah, on Flickr
IMAGE LINK: http://www.flickr.com/photos/duffohyeah/7647755850/
Rainbow Lorikeet by duffohyeah, on Flickr
(not that the Sigma was a must for these photos hehe)