I have seen this behaviour; it's fun when you get a cloud of birds
high up: Dusky WSs, Welcome Swallows, Tree Martins, and then a few
genuine Swifts!
John Leonard
On 11/3/07, Val Curtis <> wrote:
> Gembrook, Victoria. (75k west of Melbourne)
>
> On Sunday 28th October I saw a flock of woodswallows, most probably
> White-browed or possibly Dusky, circling very high over my house. I have
> recorded White-browed here once before a long time ago.
> The area is tall, closed eucalypt forest with open farmland not far away
>
> It was about 30 minutes before sunset and there was a storm approaching,
> lots of heavy dark clouds and very little wind. They were behaving as I
> would expect to see swifts behave in the conditions, circling very high over
> the trees which are about 60 meters tall (I think!) and some of the birds
> were at least that high again, some so high I could barely see them with the
> naked eye in the poor light. At a conservative guess there were about 40
> that I could see, but there could have been many, many more out of my field
> of view behind the tree tops
>
> I was unable to positively identify the species but they all appeared
> uniformly dark underneath in the poor light and were calling constantly with
> a gentle 'chup, chup' sort of sound.
>
> Is this a know bebaviour of Woodswallow species?
>
> Val
>
>
>
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--
John Leonard
Canberra
Australia
www.jleonard.net
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