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Re: Polly Want a Dinosaur?

Sorry to be so dumb about this, but MUST we differentiate all the time
between mere "dinosaurs" and "non-avian dinosaurs"?  If so, why so?  I'm
sure the information is in the archives or simply common knowledge to many
but what exactly are "dinosaurs" (not a technical defintion but what I'm
asking is; are they ALL "avian" unless stated to be otherwise now?) 
Thanks- PVS