12 amazing facts about the Sumatran rhino
The Sumatran rhino (Dicerorhinus sumatrensis) is one of the strangest and most endangered large mammals on Earth — a hairy, two-horned forest dweller that looks like it walked straight out of the Ice Age. Here are twelve facts that capture just how remarkable, and how fragile, this species really is. For the full picture, see our Sumatran rhino species guide.
1. It is the smallest rhino alive
Standing roughly 112–145 cm at the shoulder and weighing about 500–1,000 kg, it is dwarfed by the white rhino, which can top 2,000 kg.
2. It is the hairiest rhino on Earth
Its reddish-brown body is patchily covered in coarse hair — a feature no other living rhino shares, earning it the nickname the "hairy rhino."
3. It is the only two-horned Asian rhino
The Javan and greater one-horned rhinos carry a single horn; the Sumatran rhino has two, like its African cousins.
4. It is a living link to the Ice Age
It is the closest living relative of the extinct woolly rhinoceros and the last surviving member of the genus Dicerorhinus.
5. Fewer than about 50 remain
The most recent IUCN-cited field estimate puts the wild population at roughly 34–47 animals, making it one of the rarest large mammals alive.
6. It is surprisingly vocal
Sumatran rhinos communicate with whistles, squeaks and other sounds — far chattier than their larger, quieter relatives.
7. It eats from 100+ plant species
As a browser it feeds on saplings, leaves, twigs, fruit and bark, consuming tens of kilograms of vegetation a day.
8. It loves a mud bath
Daily wallowing cools the rhino and coats its skin to protect it from insects and sunburn.
9. It is a strong swimmer and climber
Despite its bulk, it navigates steep, dense rainforest and crosses rivers with ease.
10. Calves are rare and slow to arrive
After a 15–16 month gestation, a female usually produces just one calf every three to four years.
11. It is shy, not dangerous
Solitary and elusive, it avoids people whenever it can — humans threaten it far more than it threatens us.
12. Captive births offer real hope
A managed breeding programme in Indonesia has produced several hard-won calves, each one significant for a species this scarce.
WARN helps fund the Indonesian partner teams protecting and breeding the last of these rhinos. If their story moves you, you can support the Rhino Appeal.
Read the full Sumatran rhinoceros wildlife guide for the facts, IUCN status and conservation context — or donate to WARN to help fund the local partners protecting this species.
