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Re: Giant Cretaceous flightless bird

In a message dated 98-01-15 03:04:43 EST, Scendan@AOL.COM writes:

<< I realize this is a pretty darn uneducated question, but how does one
 determine the status of a fossil such as this giant Cretaceous bird as being
 other than a middlin' sized dinosaur?  (Considering its from the same time
 period, et al).  What are the criteria? >>

In this particular case, it is the strongly birdlike sacrum and pelvis. Also
an unillustrated limb bone. Unlike those of any of the usual "non-avian