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In a message dated 95-11-29 07:46:31 EST, rhengst@ (Richard
Hengst) writes:

> When an up and 
>down "bobbing" of the head started, a fight was gonna start.  It almost
>as if an ostrich is measuring up size or intent with another ostrich but
>also do it when annoyed by tourists.  Fighting cocks do the same thing (I
>lot of cockfights when I was stationed in the Phillipines in the late 60's).
>This makes me wonder if similar displays would have been used by Theropods.
>appears that fights only occur when a "winner" and a "loser" cannot be 
>determined through "bobbing". 

Sure, theropods could well have exhibited this kind of behavior. (But how
could we confirm this?)