Peter. The Black Falcon images on Aviceda clearly show two-toned underwinged
pattern. Pizzey and Knight also show the underwing for Black Falcon to be
two-toned, though "less contrastive than with dark morph Brown Falcon".
Steve Murray
-----Original Message-----
From:
On Behalf Of Peter Shute
Sent: Tuesday, 22 July 2008 4:13 PM
To: Chris Sanderson; bird
Subject: bkack falcon
So this leaves the "distinctive wing" feature to be explained. I guess
this means either the "diamond" shape that was discussed, or the dropped
gliding profile. Could either of those belong to a Brown Falcon?
The Black Falcon sighting I and another had in Altona, later reduced to
a possibility because of some visible tail barring, showed the drooped
wings but, possibly, two tone wings. If that is what was seen in this
case too, then it leaves me confused.
Peter Shute
> -----Original Message-----
> From:
> On Behalf Of Chris
> Sanderson
> Sent: Tuesday, 22 July 2008 4:02 PM
> To: bird
> Subject: Re: [Birding-Aus] bkack falcon
>
>
> Hi Richard,
>
> I would count bi-coloured wings as being one of the key
> features of a Brown Falcon in flight, and grey legs doesn't
> rule out Black Falcon. Brown Falcons have primaries that let
> the light through, hence giving their wings a two-tone effect
> in flight, whereas Black Falcons have very dense primaries
> that let no light through, giving their wings a single solid
> colour. There was a great discussion of raptor ID recently
> on the B-Aus archives which included a section on Black Falcons.
>
> Some images for reference:
> Black Falcon:
> http://www.aviceda.org/abid/search.php?action=searchresult&p=1
0&keyword=black+falcon
Brown Falcon:
http://www.aviceda.org/abid/search.php?action=searchresult&p=15&keyword=
brown+falcon
Hope this helps.
Regards,
Chris
On Mon, Jul 21, 2008 at 5:08 PM, richard turner <>
wrote:
> Peter , Greg and others,
>
> Yes, they were Black Falcons.We saw the bi-coloured pattern of the
> wings, grey legs and dstinctive wing as it flew toward us.
>
> There had been a thread on raptors hovering, so I added in this
> information.
>
> Agreed, it is not normal behavour for a black Falcon, but it was a
> very windy day.
>
> I believe it is not normal behavour for this species to be perched on
> poer line poles, as one of thses birds was.
>
> We enjoyed the sighting
>
> Dick Turner
> www.birding-aus.org
> birding-aus.blogspot.com
>
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