Thanks, Conogre; good explanation. I suppose it not being technically horn is why it's hard to find as "horn" when reading about giraffes. All horns are, AFAIK, modified/grown-together hair, and I've never been clear on what basis the distinction of "true" horn is drawn; I suspect it involves a naked-eye "hairiness" of appearance; another horn often called compressed hair/not true horn is pronghorn horns, and they are largely hollow with a bone center, not unlike cattle horns.
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