I have come in late on this thread, but must comment on Carol Probet's comment
In the Blue Mountains, at least, they tend to inhabit wet forest which has
been invaded by weeds, particularly those that bear fruit.
Blackbirds are a common vector for a number of weed species (English Ivy and
Blackberry, for example, and I think it is a moot question whether the
Blackbirds invade first,and the weeds inevitably follow, or vice versa. I have
pulled out hundreds of Blackberry, Ivy and Pittosporum seedlings under Blackbird
perches. My view is that the Blackbirds are creating habitat that suits them
(co-evolution with Blackberry and Ivy?). They are certainly not benign
foreigners, in spite of their attractive song, but agents for environmental
degradation (one of many, of course).
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