Which critically endangered rhino species has two horns and lives in Southeast Asia?

The critically endangered rhino with two horns that lives in Southeast Asia is the Sumatran rhinoceros.

The Sumatran rhinoceros (Dicerorhinus sumatrensis) is also called the Asian two-horned rhinoceros or hairy rhinoceros. It is the smallest living rhinoceros species and is covered in reddish-brown hair, an unusual feature among modern rhinos. Its larger front horn is followed by a much smaller second horn, which may appear stub-like.

Historically, Sumatran rhinos ranged across parts of India, mainland Southeast Asia, Sumatra, and Borneo. Habitat loss and centuries of hunting for their horns have reduced them to scattered populations, now concentrated mainly in Indonesia. Their isolation makes protection difficult and increases the risks of inbreeding and failed reproduction.

The black rhinoceros also has two horns, so horn count alone is not enough to identify the answer. The geographic clue matters: black rhinos are native to Africa, while the Sumatran rhinoceros is the Asian species associated with this combination of two horns, thick hair, and rainforest habitat.