At 12:24 AM 3/7/2008, Aaron wrote:
>On Thu, Mar 6, 2008 at 1:00 AM, David Ellsworth
><<davidells%40cox.net>>
>wrote:> At 2008-01-30 14:27, Doug Von Gausig wrote:
> > >My sonograms of 6 different examples of the dive sound all show two
> > >distinct frequencies being produced, not at multiples of each other, s=
o
> > >they are not harmonics. This says to me that the sound is not vocal, t=
oo.
>
>Now you've got me inspired, there's an Anna's or two up on our hill
>here that not infrequently have been engaged in exactly the display
>you described: one (male) perched on a branch, while another
>repeatedly hovers, dives, hovers, dives, over and over, on each dive
>producing the dive sound. It's funny, before this whole story broke to
>our consciousness, my wife and I had noted the sound and IDed as
>coming from a diving Anna's, but had not idea it was a tail sound...
>:)
>
>If I can get it together (our daughter turns one month old tomorrow!)
>I'll try to record it up with my rig that can go up to 96K with
>extended frequency mics... not parabolic, just Sennheiser MKHs in MS,
>though...
>
>best,
>aaron
I'd be interested to see what you record, Aaron. If there are two males
involved in the displays you are seeing either of two things (or both) is
occurring. Either the displaying bird is practicing for when the females
arrive (that's common here) or he is disputing territory with the other
male. Often birds use displays that would otherwise be breeding behavior
agonsitically, directed at other male rivals.
Let us know what you record!
Doug
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Digital Sounds and Photos from Nature
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