Bad neighbours, Corroboree Park

To: "Geoffrey Dabb" <>, <>
Subject: Bad neighbours, Corroboree Park
From: Julian Robinson <>
Date: Mon, 04 Jan 2010 14:51:29 +1100
Thanks Geoffrey, good graphic, though I don't understand the grey arrows.

Mynas and Dollarbirds coexisting as residents might be related to the Dollarbird also seeming to be a pugnacious bird and well capable of competing with Mynas.  I was watching a pair of Galahs fussing around a nest hollow in CBrae for quite some time.  The Galahs seemed to own the hollow and invested a lot of effort on it over an hour, until a single Dollarbird flew up and cleared the Galahs out in less than a second, no argument at all.  The Dollarbird did not seem to be using it and just flew away afterwards but maybe was staking a claim.  My interpretation being that if a Dollarbird is capable of easily dominating two Galahs, then even Mynas might not be a problem for them. 

At 11:09 AM 3/01/2010, Geoffrey Dabb wrote:
A most informative graphic, thank you Julian.  I've not been to Corroboree Park and must pay a visit.  It seems to be a major centre of activity.  I wonder if I shall not see more birdwatchers than actual corroboree participants?
On the question of neighbours, the below barely-decipherable offering is an attempt to superimpose the dollarbird map from HBW on the (now-dated) Common Myna distribution in John Long's 'Introduced Birds of the World'. The exercise faces the difficulty that different projections are used which changes both the shape of the land masses and their relationship to one another.  If you can work it out, it shows that in the breeding season the DB does indeed overlap introduced pockets of the resident detested myna in Australia.  However the birds know one another from elsewhere.  In parts of SE Asia and southern India the 2 are residents side by side.  There is an area in southern China where resident mynas are invaded by dollarbirds on their summer expeditions northwards.
Incidentally, this is an example of a species with a significantly non-Australian distribution which now bears an Australian-origin standard name.  According to Gould (who called it ?Australian Roller?) it was a ?Dollar Bird? to the ?Colonists?.  The other example I can think of is ?Swamphen?.   
2 species.jpg
-----Original Message-----
From: Julian Robinson
Sent: Sunday, 3 January 2010 12:35 AM
To: canberrabirds chatline
Subject: Bad neighbours, Corroboree Park
I thought a picture of the nesting Dollarbirds in Corroboree Park was posted recently, but can't find it.  The Dollarbirds have been nesting for at least two weeks and I went to check them out again today.  The neighbours are a bit sad, not Noisy but Common.  The left nest was in the adjacent tree to the Dollarbirds, and the other one is 20-30m away.  Maybe CIMAG should do some more selling in the area, or is it one of the control areas in current Myna studies?
Incidentally a SC Cockatoo was trimming a strip of bark from in front of a hollow on the recently lopped tree there. Hopefully the tree will be hosting nests again sooner than some of us thought. Maybe it was the hollow previously used by the Gang-gangs.

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