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Re: Dinosaur beaks

> Are there features which suggest the presence (or the absence) of a beak 
> in critters like e.g.: 
>      Archaeopteryx 
>      Microraptor 
 
These two are known from several very well-preserved specimens. All of 
these preserve claw sheaths. This makes it IMHO very likely that the 
equally keratinous beak would have been preserved, too, if it had existed. 

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