Rainbow Lorikeets are widespread in eastern and northern Australia, and also around Perth. Separated from their natural range by thousands of kilometres, the feral Rainbow Lorikeets of Perth had become established by the late 1960s. In the 1980s, the population expanded. 
The problem with Rainbow Lorikeets in Perth is that they are aggressive around nesting hollows, preventing native birds from nesting. 
They have even been recorded dragging the nestlings of Australian Ringnecks from hollows and dropping them onto the ground, then occupying the hollow themselves.

I hope this one was a vacant hollow in the tree? we saw one Lorikeet enter the hollow, this one stood guard the whole time time he wasn't moving until we left..