FreeLists / tn-bird / [TN-Bird] More Red Crossbill info

[Bill Pulliam <bb551@xxxxxxxxxxxxx>]

For those who are curious to learn more, the most accessible resource  
I have found is:

http://research.amnh.org/ornithology/crossbills/contents.html

It hasn't been updated in a while, but I found it useful.

Briefly, in the southeast, this site suggests we likely have:

Type 1:  Small.  Associated with white pine and hemlock.
Type 2:  Large.  Heavy-coned pines -- pitch, table mountain, possibly  
loblolly etc.
Type 3 (possibly):  Smallest.  Hemlock, spruce.

I found in trying to distinguish types 2, 4, and 5 in Colorado that a  
combination of vocalizations, size (especially the heaviness of the  
bill), and habitat worked reasonably well.  They did seem to  
approximately sort out into ponderosa pine, douglas fir, and  
lodgepole pine associates, but were not rigorously restricted to just  
the one "favorite" conifer species especially in mixed forest.

Bill Pulliam
Hohenwald TN


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