Once the most widespread of Asian rhinoceroses but now possibly the rarest large mammal on Earth, Vietnam’s last Javan rhinoceros has been killed by poachers, the World Wildlife Fund reports.

The last rhino in Vietnam is shown in 2004 in Cat Tien National Park in southern Vietnam. (AP)

“It appears that protection is not being given a high priority by the Vietnamese government,” a WWF spokesman said.

Poaching is a popular sport in Vietnam, with rhino horns fetching up to $50,000 per pound. The average Vietnamese farmer makes around $7.50 a day.

The Javan rhino is now extinct in mainland Asia, and while a few dozen survive in the wild in Indonesia, there are none in captivity.

Below, see rare footage of the rhinos in Indonesia: