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HESPERORNITHID FEATHERS etc
On birds with down-like feathers (as Ron pointed out,
_Sinornithosaurus_ and the like may have lacked true down: however,
I think the argument is that their integument was down-like, if you
will), Tim wrote..
> Feather impressions found associated with one hesperornithid specimen
> are very hair-like...
Apparently the thing about hesperornithiforms having plumalaceous
feathers is not right. Per Christiansen has discussed this in an MS
which I think is in press (pers. comm.).
On _Archaeopteryx_: I forget where I read it, but don't the bases of
_Archaeopteryx_ feathers have plumalaceous tufts? These are at least
suggestive of an insulative function. This is in the archives somewhere.
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