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A few very short questions

Some of you may remember that I asked a few questions a while back, for a 
dinosaur book I was writing for children. The book is in the last stages of 
pre-production, and the fact-checker has questioned 3 "facts".  I was hoping 
some of you might be able to assist me by confirming or negating these 3 

1. I said dinosaurs are reptiles.  
 Is it true that dinosaurs are considered to be close relatives of reptiles, 
but in a class of their own?  

2. I  said the smallest pachycephalosaur was 20 inches long (which I had 
read, but I can't remember where.)   Is this correct?  If so, does anyone 
have a reference for this? 

3. I said that  scientists think the frills  of some dinosaurs may have 
changed color.   Is this correct?   Does anyone know who the proponents of 
this theory are?

Thanks for any assistance you can provide.

Barbara Saffer, Ph.D.  (science writer)