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Hi Trevor,
There has been a cycle that the birds have gone through here in and around Brisbane.
I can't comment on WA.
25 years ago many homes were being proofed by contractors against bird entry into roof voids. Most (nearly all) the invasive birds were introduced pests. Sparrows and Starlings.
This eventually resulted in their numbers greatly declining. The number native birds suffered while the pest numbers were up. Consequently the native bird population recovered.
I live about 40 klms north of Brisbane CBD. On 2 acres, with many big gum trees and fruit trees. The native bird population is fantastic here.
I sometimes leave some food out for them. Not a lot and not often. I don't want them becoming too dependant on my feeding them.
The visitors include a few dozen different species. Its interesting how they develope the feeding "pecking order". White Cockatoos first through the Galahs and eventually the Lorrikeets. Pale Headed Rosellas etc in between.
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