Enter Africanum house (closed on Mondays) A rhino horn is most valuable to rhinos. In recent years rhino numbers have dropped dramatically due to poaching for their horn which is prized in Asian countries. Although, rhino horn is composed largely of keratin, a protein also found in hair and nails. Horns help them forage for foodstuff, protect their young, and in dominance and territorial displays. Take a look on a poster and answer, how dangered is actually rhinoceros?