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RE: Caudipteryx suffered from osteoarthritis

Ah, with Zheng and Martin on board, you know it's an ABSRDist rant from the 
BAND camp. The "larger bird (Caudipteryx)" and "one of the forms considered _by 
some_ to be a fearthered dinosaur" lines don't help with the framing, rather 
than making it about the study of osteoarthritis. That *Caudipteryx zoui* lies 
outside a clade of animals conventionally termed "birds" could have better 
impact for framing, so the authors don't help themselves by narrowly confining 
their scope.


  Jaime A. Headden
  The Bite Stuff (site v2)

"Innocent, unbiased observation is a myth." --- P.B. Medawar (1969)

"Ever since man first left his cave and met a stranger with a
different language and a new way of looking at things, the human race
has had a dream: to kill him, so we don't have to learn his language or
his new way of looking at things." --- Zapp Brannigan (Beast With a Billion 

> Date: Wed, 4 Jan 2012 19:07:50 -0800
> From: bscreisler@yahoo.com
> To: dinosaur@usc.edu
> Subject: Caudipteryx suffered from osteoarthritis
> From: Ben Creisler
> bscreisler@yahoo.com
> A new online article (classifies Caudipteryx as a bird, however):
>  Bruce M. Rothschild, Zheng Xiaoting & Larry D. Martin (2012)
> Osteoarthritis in the early avian radiation: Earliest recognition of the 
> disease in birds.
> Cretaceous Research (advance online publication)
> doi:10.1016/j.cretres.2011.12.008
> http://www.sciencedirect.com/science/article/pii/S0195667111002084
> Abstract
> Osteoarthritis is extremely rare in wild mammal populations (less than 1%) 
> and varies in frequency according to species (0--25%) in recent birds, where 
> it is inversely related to size. Large population samples of Early Cretaceous 
> birds in China permit us to analyze its frequency in one of the earliest 
> avian radiations. In these samples, the larger bird (Caudipteryx) shows a 
> high frequency (30%). The earliest previous documentation of primary 
> osteoarthritis in any animal is in a family of Early Cretaceous dinosaurs 
> (Iguanodontidae). We document its occurrence in a basal bird and in one of 
> the forms considered by some to be a feathered dinosaur. These occurrences 
> are 20 million years older than the next oldest occurrence of osteoarthritis.