Hmmm... Not sure how that happened - try http://tinyurl.com/nd3y6
Doug
At 04:29 PM 1/26/2008, David Ellsworth wrote:
>Hello Doug,
>
>I would like to listen to and study your recording, but you posted the
>same tinyurl twice =97 the spectrogram picture. Could you please give us t=
he
>URL of your recording?
>
>David
>
>At 2008-01-26 10:31, you wrote:
>
>>I know this is an old topic, but, to my knowledge it has never been
>>conclusively settled.
>>
>>Having read Louis Baptista's work
>>(<http://tinyurl.com/ysl4l8>http://tinyurl.com/ysl4l8) and many,
>>many others over the years, I am still unconvinced myself how this sound =
is
>>made. Most of the recordings I have of the sound have a distinct wing tri=
ll
>>preceding them. That trill is the sound of wings building up speed before
>>the pullout at the bottom of the dive. But I also have several samples th=
at
>>lack that precursor and which were recorded without seeing the bird. That
>>in itself means little, but the interesting thing is that both types of
>>samples often show two distinct frequency bands at the same instant. (see
>><http://tinyurl.com/2xy3ve>http://tinyurl.com/2xy3ve) - hear the sample a=
t
>><http://tinyurl.com/2xy3ve.This>http://tinyurl.com/2xy3ve.This is
>>something we commonly see in oscine
>>Passerines, since they have two syrinxes, but not in non-oscines. The two
>>bands may indicate more complex vocalizations that we expect in hummers,
>>but it may also indicate that there are two different places generating t=
he
>>sound (like two different tail feathers or groups of feathers). It seems
>>unlikely to me that these two bands come from vocalizations...but maybe..=
.
>>
>>I'd be interested in hearing your thoughts and experiences with this.
>>
>>Has anyone ever seen an Anna's Hummingbird make this sound while sitting
>>stationary?
>>
>>Does anyone know of any high-speed movies of the dive and sound being mad=
e?
>>
>>Other thoughts about how we could conclusively settle this? Or do most
>>believe that Baptista's work settles it?
>>
>>Doug
***************************************
Doug Von Gausig
Natural Sounds and Photos at:
http://naturesongs.com
More Photos at:
http://www.criticaleyephoto.com
Clarkdale, Central Arizona, USA
***************************************
|