Even a few weeks after birth, the horn is developing. It starts off as a bony-looking (but not actually bony) lump on the tip of the nose, gradually resolving into a rounded knob after about five weeks. It continues to grow, eventually becoming the distinct horn. The horn is composed entirely of keratin, lacking the bony core usually seen in “true” horns — the attached ScienceDaily story explores research into the actual composition of rhino horns.
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