Many thanks to those who responded to my query.
We've checked on the condition of the tree and it seems likely
it will have to go in a few years. As the cockatoos are not
currently nesting there (and may have shifted to another site a
mile away) we've concluded that we'll not fight this one and use
this opportunity to set a precedent for nest boxes going up in
our parks to substitute for the hollows which are rarely allowed
(for safety reasons) to develop.
Another potential issue is about another creature in the park.
Long finned eels were found when draining the lake. I had never
heard of them before: real monsters up to 1.5 metres long and
weighing up to 20 kg. The largest native animal surviving inland
in our area !
But they eat almost anything, including ducklings. See:
http://www.ifc.tas.gov.au/fact_sheets/
Michael Norris
Bayside Friends of Native Wildlife
Birding-Aus is on the Web at
www.shc.melb.catholic.edu.au/home/birding/index.html
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