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Re: climbing dromaeosaurs and friends

In a message dated 12/7/00 10:38:05 PM EST, scott_hartman@hotmail.com writes:

<< Which certatosaurs are you refering to?  Certainly well reserved Ghost 
 Ranch Coelophysis didn't have a retroverted hallux. >>

It certainly does. Take another look. But it's not quite as distal as in 
later theropods and birds, but as in all cursorial theropods it is reduced 
(secondarily). In cursorial theropods (and in phorusrachids and in extant 
ratite birds, too) a truly retroverted hallux is an impediment to running, so 
it quickly reduces to a loosely articulating, nearly vestigial digit.