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re: bipedal apatosaurs & stegosaurs - tails for defense

There is no proof that diplodocids or stegosaurs used their tails for
defense against predators; these ideas are entirely supposition, and to
speak of them as fact is misleading. While this idea *might* work for
diplodocids, an aerial view of _Stegosaurus_ (see DINOSAURS PAST & PRESENT
- VOL. II, either Paul or Czerkas) will give you an idea of how difficult
it would be for that animal to keep an eye on a predator attacking from
behind. The rear is not the best place for armament, and stegosaur tail
spikes were probably used for other behavior than defense, possibly display
or courtship.

Brian Franczak