Hi Alistair,
I'll defer to the experts on this one, but I think you'll find its related
to feeding - the ability to grasp prey under sand or mud while probing with
your bill closed (so you don't swallow said sand or mud). The flexion while
roosting would be the equivalent to a wing stretch.
Regards,
Chris
On Mon, Jun 23, 2008 at 10:45 AM, Alistair McKeough <
> wrote:
> Great photos Bob, as always.
>
> I've never observed that behaviour - it is rather curious. Any idea what
> purpose it serves?
>
> Alistair
>
> 2008/6/22 Robert Inglis <>:
>
> > I have recently created a set of photos showing how Bar-tailed Godwits
> have
> > the capability of 'hinging' or 'flexing' their upper mandibles.
> >
> > To see the set of photos go to:
> >
> > http://www.flickr.com/photos/ptiloris463/sets/72157605745259489/
> >
> > Bob Inglis
> > Sandstone Point
> > Queensland
> >
> >
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