I have come in late on this thread, but must comment on Carol Probet's comment
below:
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).
Cheers
Ian
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