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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