YTB Cockatoos

To: Anthony Mitchell <>
Subject: YTB Cockatoos
From: "Paul McDonald" <>
Date: Sat, 30 Jun 2001 18:59:38 +1000
HI Anthony,

I was wondering the same thing today, as I am still hearing many cockatoos, distracting me from paperwork that needs doing urgently!

Given the large numbers of birds that are nearly daily moving around, some I notice, now that I am paying more attention, in opposite directions now (ie ocasionally west), I would be surprised if this was a large scale migration movement involving new birds every time. A large population congregating to take advantage of a new/predictable food source seems more likely. Interesting though that I didn't notice the movement at all last year, when I was also in Geelong at this time of year. I won't get time to see where they are going/coming from this week, perhaps other Geelong folk will fill us in?

Also noticing some agonistic behaviour which is quite interesting. I wasn't close enough to determine the sexes of the birds involved, but I saw two birds flying close together, when approached by a third the same bird from the pair consistently chased the newcomer in the opposite direction for 50m or so, before returning to flying with the 'partner'. The whole process was repeated often a few seconds later. Much calling accompanied this, almost a buzzing type call as oppossed to the usual cries of YTBC, which was a new call for me and quite interesting. I don't know enough about YTBC ecology to speculate (but will anyway!), it's tempting to think perhaps pair bonds are strong (maintained year round), or develop much earlier than the initiation of the breeding event.

Happy Birding,

Paul McDonald

On 29 Jun 2001, at 15:06, Anthony Mitchell wrote:

> I never did take the time to follow them to see where they roosted.

Please report all sightings of colour banded Brown Falcons:
Ph: 03 5224 2938
Mbl: 0410 679 022

Paul McDonald
Division of Botany and Zoology
School of Life Sciences
Australian National University
Canberra, A.C.T.
Australia 0200
Ph:  +61 02 6125 2536
Fax: +61 02 6125 5573
Mbl: 0410 679 022
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