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>>Now, among dinosaurian prey, mostly the herbivores, which ones use the
>>"fight" and "flight" techniques to survive predators?

You seem to forget the third option: the buddy system (as in, when the bear
shows up, feed him your buddy).  This is a very common method of protection
in nature, especially for groups with a very good potential for replacing
lost numbers (i.e., dinosaurs).

>>1) Ceratopians?
>-Small genera would usually use flight, while the larger would choose fight.
>>2) Hadrosaurs?
>-Flight mostly

>>3) Hypsilophodontids?
Flight & numbers

>>5) Iguanodonts?
>>7) Diplodocids?
The whip-tail is a damn good defense, too, as well as sheer bulk.

>>8) Brachiosaurs? 
Size is probably the main defense here.

>>14) Ornithomimosaurs?
>>15) Plateosaurs?
The big thumb claw might be a good defense.

And as for therizinosauroids: the claws, especially the meter plus long
claws of Therizinosaurus itself, would be a damn good defense, especially in
an animal which sacrificed most of the normal theropod cursorial adaptations.

Thomas R. Holtz, Jr.
Vertebrate Paleontologist
Dept. of Geology
University of Maryland
College Park, MD  20742
Email:Thomas_R_HOLTZ@umail.umd.edu (th81)
Fax: 301-314-9661