Nathan,
Thank you for referring me to this web site. This is amazing
information. I'm surprised that so many recordings and so much
information is available on this species group that seems so
confusing to most of us. I'll have to sort out my recordings and
make sonograms to decide which type or types of crossbill I
recorded. I'll also be more careful to get any crossbill recording I
can and document the location, type of conifer it's using, ect.
If you post your information on the web please let us all know, it
should be a very helpful resource.
Kevin Colver
On Aug 4, 2008, at 9:18 AM, Nathan Pieplow wrote:
>
> Kevin et al.,
>
> You can find descriptions of the crossbill types online at Jeff
> Groth's old page:
>
> research.amnh.org/ornithology/crossbills/
>
> I have been meaning to post a much more extensive crossbill type ID
> site, but I haven't gotten around to it yet. I do have a useful
> reference for anyone who would like it: I photocopied all the
> sonograms from Groth's crossbill monograph and rearranged them by
> type (in the original, they were arranged by geographic
> location). The result is a series of .jpg files that provide a quick
> reference to the level of variation within each call type.
>
> Contact me off list if you would like a copy of these files. If I
> get a decent response, maybe I'll be motivated to create that
> webpage at last.
>
> Nathan Pieplow
> Boulder, Colorado
>
> >Last week I recorded some red crossbills. They are supposedly
> >divided by voice into 9 groups or subspecies. The location I
> >recorded had two clearly different populations in nearly the same
> >tree, their calls were dramatically different. One group that I've
> >been used to in the mountains of central Utah has calls like a barn
> >swallow, the other which I hadn't heard before almost sounded like
> >robin alarm calls. I'll have to post them when I get some time.
> >Anyone know where all the call types are posted so I can do some
> >comparisons?
> >
> >Kevin
>
>
>
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