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>>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?)
Obviously, we can't confirm this in nonavian theropods. However, it is
expected in all dinosaurs on phylogenetic grounds.
Both lepidosaurs and birds use head-bobbing in intraspecific display. This
is probably a basal diapsid behavior, so the expectation is that, unless
they lost this behavior for some reason, extinct diapsids used head-bobbing
Of course, there is the question of crocodiles. Do they use head-bobbing?
If not, either they lost that feature or the behavior evolved independantly
in lepidosaurs and birds.
Thomas R. Holtz, Jr.
Dept. of Geology
University of Maryland
College Park, MD 20742