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Re: Dinosaur "spikes"

 I think some would even dispute the psittacosaur quills (?) which is
 the basis for many later ceratopsians having spines and quills.  The
 new Triceratops skin impressions do show signs of "something" growing
 out of the large osteoderms on its back...so at least thats exciting.

Osteoderms? Bone? Do you just mean big scales?