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Re: FW: Paravian claw studies

To have any hope of showing that bone cores accurately reflect the shape of 
the keratin sheath would require showing this actually occurs in a large # 
of extant birds, and in fossils. From what I have seen I so seriously doubt 
that it does that it is not close to being worth my effort -- if someone 
else wants to try go ahead. The way to account for problems in measuring 
keration sheaths in a given fossil taxon is off course to measure as many 
specimens as possible to see what the range is.