After receiving a comment in response to my post to the chatliine I have delved around in the data a little further. Rather than send a bunch of images I have put these up as a blogpost http://franmart.blogspot.com.au/2012/04/little-corellas-and-sulphur-crested.html.
Martin
On Sun, Apr 1, 2012 at 9:39 AM, martin butterfield <> wrote:
Con
I think the answer is probably not. The attached GBS based graph shows that the Corellas have - as you indicate - made a massive increase in the recent past, but while the Cockies have a slight downward trend from a high point, they are still a long way in front. The graph also served to jog my mind about how far Cockies have increased in the past 30 years.
In Ian Fraser's latest book he wonders if Corellas will overtake Galahs (the latter having themselves only arrived in this area in the last ~60 years).
Martin
On Sun, Apr 1, 2012 at 9:00 AM, Con Boekel <> wrote:
This morning a flock of 170 Little Corellas flew over Haig Park in Turner. It is obvious that Little Corella numbers in Canberra have climbed over the past quarter of a century - certainly in the Inner North. I often notice Little Corellas feeding in the same trees as Sulphur-crested Cockatoos - on the same food.
The question I have is this - are our Sulphur-crested Cockatoos declining as the Little Corellas increase?
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