What rhinos have gone extinct?

* Western black rhinoceros (Diceros bicornis longipes)

* Extinct in 2013

* Once found in Cameroon, Central African Republic, Chad, Kenya, Niger, Nigeria, South Sudan, and Tanzania

* The main cause of extinction was poaching for their horns, which are highly valued in traditional Asian medicine

* Northern white rhinoceros (Ceratotherium simum cottoni)

* Extinct in 2018

* Once found in Chad, the Democratic Republic of the Congo, Kenya, South Sudan, and Uganda

* The main cause of extinction was poaching for their horns, which are highly valued in traditional Asian medicine

* Javan rhinoceros (Rhinoceros sondaicus)

* Critically endangered

* Once found in Bhutan, China, India, Indonesia, Laos, Malaysia, Myanmar, Nepal, Thailand, and Vietnam

* The main cause of extinction is poaching for their horns, which are highly valued in traditional Asian medicine

* Only about 67 Javan rhinoceroses remain in the wild

* Sumatran rhinoceros (Dicerorhinus sumatrensis)

* Critically endangered

* Once found in Bhutan, Cambodia, China, India, Indonesia, Laos, Malaysia, Myanmar, Nepal, Thailand, and Vietnam

* The main cause of extinction is poaching for their horns, which are highly valued in traditional Asian medicine

* Only about 80 Sumatran rhinoceroses remain in the wild