See: Groth J.G. 1992.
Further Information on the Genetics of Bill Crossing in Crossbills.
Auk 109 (2): 385-389.
which can be found at:
http://sora.unm.edu/sites/default/files/journals/auk/v109n02/p0383-
p0385.pdf
Peter Post
New York City
[email protected]
On Feb 21, 2013, at 9:19 AM, greg prelich wrote:
I've been looking at some photos I took recently of Crossbills and
noticed that on one bird the upper mandible crosses over the right
side of the lower mandible and on another bird it crosses on the
left. Does anybody out there know if there is a preference either
way, or is it a 50% proposition?
Greg Prelich
New Rochelle
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