What Are Rhino Horns Made Of? Keratin and Poaching Facts

What is inside a rhino horn?

A rhino horn is built from tightly packed tubes of keratin, a structural protein, held together by more keratin. Under a microscope it looks a little like a bundle of hair fibers glued into a solid mass, which is why people sometimes say rhino horn is “compressed hair”. That phrase is a simplification: the horn is not made of hairs stuck together, but it is made of the same material.

The center of the horn is denser than the outside. It contains deposits of calcium and melanin, the dark pigment also found in skin. These make the core harder and help protect it from sunlight, while the softer outer layers wear away, especially when rhinos rub their horns on the ground, rocks or trees. This wear is why horns grow into a sharp, tapering shape.

The horn sits on a rough, bumpy area of bone on top of the nose and forehead, but it is attached to the skin, not fused to the skull.

How rhino horns compare with other horns and antlers

How fast do rhino horns grow?

A rhino horn grows from its base for the animal’s whole life, much like a fingernail. In African rhinos, studies of wild animals give a growth rate for the front horn of roughly 5–8 cm (2–3 in) a year, with the rear horn growing more slowly. Young rhinos grow horn faster than old ones, and horn regrows fastest in the first year after it is broken or cut.

Horn size varies by species:

• White rhino: front horn often around 60 cm (24 in), exceptionally about 1.5 m (5 ft), mostly in females.
• Black rhino: front horn usually about 50 cm (20 in), exceptionally well over 1 m (3.3 ft).
• Greater one-horned rhino: a single horn of about 20–60 cm (8–24 in).
• Sumatran rhino: two horns, the front usually 15–25 cm (6–10 in).
• Javan rhino: a single small horn, usually under 25 cm (10 in); many females have only a bump.

What do rhinos use their horns for?

Horns are tools and weapons. Rhinos use them to defend themselves and their calves against lions and hyenas, and bulls use them in fights over territory and mates. A black rhino also uses its horns to break branches and dig up roots, and rhinos of both African species dig in soil for water or minerals. Mothers have been seen guiding their calves with the horn.

Horns also matter in display. A bull wiping and scraping his horn on the ground or on bushes is marking his territory and signaling his strength to rivals.

Why poachers kill rhinos for their horns

Rhino horn has been used for centuries in traditional Chinese medicine, ground into powder to treat fevers and other illnesses. In Yemen, carved rhino horn was prized for dagger handles, and in the 1970s and 1980s this was a major driver of poaching. Today demand comes mainly from Vietnam and China, where horn is bought as medicine, as a supposed hangover or cancer cure, and as a luxury status item.

None of these uses is supported by scientific evidence. Taking rhino horn is, in effect, like chewing your own fingernails.

International commercial trade in rhino horn has been banned under CITES (the Convention on International Trade in Endangered Species) since 1977. Even so, organized crime networks smuggle horn from Africa to Asia, and a single horn can be worth tens of thousands of dollars. Poaching in Africa peaked in 2015, when about 1,349 rhinos were killed. The white rhino, which lives in open country, has been hit especially hard. For current numbers, read how many rhinos are left.

Dehorning: cutting horns to save rhinos

Because the horn is what poachers want, many reserves in southern Africa now remove it before poachers can. In dehorning, a wildlife vet sedates the rhino and a team saws off most of the horn, leaving the base so that the living tissue underneath is not harmed. The cut surface is then smoothed. Because the outer horn has no nerves, the trimming itself is painless, similar to cutting a nail.

The horn grows back, so dehorning has to be repeated, usually every one to two years. It does not make a rhino completely safe, since poachers sometimes kill dehorned rhinos for the stump. But it works: a study published in Science in 2025, covering 11 reserves in South Africa’s Greater Kruger area from 2017 to 2023, found that dehorning reduced poaching by about 78%. Studies of dehorned rhinos have found little effect on how far they roam or where they live, although researchers keep monitoring their behavior.

Other approaches, such as stockpiling seized horns, campaigns to reduce demand, and tougher prosecution of traffickers, are used alongside dehorning. Debate continues over whether any legal trade in horn would help or harm rhinos; most conservation groups oppose it.

Myths about rhino horns

• “Rhino horn is a strong medicine.” False. There is no reliable evidence it treats any illness.
• “Rhinos die if their horn is removed.” Not when it is done properly by vets. Poachers, however, often hack the horn out deep into the living tissue, usually after killing the animal.
• “The horn is part of the skull.” No. It is attached to the skin and sits on the bone without being fused to it.