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There's mitochondrial DNA in strands of hair (which can be used to test parentage, but isn't individual), you can't tell species with MtDNA (at least not in the same way you can with chromosome counting), you need the base of the hair for that.

I don't really think that's an issue when using this 'horn'..

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Rhino horn is made of hair not bone. I have no idea of the implication or relevance of this, I just wanted to appear smart