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Re: Horning in
> Are sheep & antelope horns covered in keratin?
Keratin = horn substance. (Even in the name: keras = horn in Greek.) The
hollow part of a horn, you know, used for drinking, is keratin.
> Have outer-sheath keratin impressions ever been preserved
> with ceratopsian remains?
Don't think so... keratin, being a protein, isn't easily preserved. There
are a few claw sheaths in Mongolia (e. g. brooding *Citipati* specimens),
but otherwise one needs sites with soft-tissue preservation (Solnhofen