birding-aus

Re: Shell Wildlife Photographer of the Year - "song-rings"

To:
Subject: Re: Shell Wildlife Photographer of the Year - "song-rings"
From:
Date: Fri, 11 Jan 2008 13:03:22 +1100
It's a great photo, as are the other winning photos.

The "song-rings" are vortex rings, like smoke rings:
    http://en.wikipedia.org/wiki/Vortex_ring

In this case, the vortex becomes visible as the moisture condenses
in the cold air rather than being particles as in smoke.  The short
pulses of sound in a Corn Bunting's call combined with its open
mouth apparently are ideal conditions to create a vortex ring.

If you know how to blow smoke rings, you should also be able to
blow "song-rings" on a still, cold day; I'm looking forward to
winter to try it.  (Anything to end summer...)

-- 
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
   Paul Taylor                           Veni, vidi, tici -
                    I came, I saw, I ticked.
===============================
www.birding-aus.org
birding-aus.blogspot.com

To unsubscribe from this mailing list, 
send the message:
unsubscribe 
(in the body of the message, with no Subject line)
to: 
===============================

<Prev in Thread] Current Thread [Next in Thread>
Admin

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the birding-aus mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU