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Re: Bird vs. theropod dinosaur tracks/trackways

In a message dated 4/12/99 8:13:19 AM EST, smithjb@sas.upenn.edu writes:

<<  I have seen theropod trackways that "waddle" in the Early Mesozoic 
 on the east coast.  Hithcock's opinions aside, I think most of us feel 
 that those tracks are not "birds." >>

And how do we know these >aren't< tracks of birds?