Javan Rhino
One population, one park — the most precarious large mammal on Earth
No photo available for Javan Rhino
Population
Around 76 individuals
Location
Ujung Kulon National Park, Java, Indonesia
Overview
The Javan rhino is the rarest large mammal on Earth. The entire known wild population — every single individual — lives in one national park on the western tip of Java. Once ranging across much of Southeast Asia, the species was eliminated by hunting and habitat loss. The sole remaining population is entirely surrounded by ocean on two sides and a rapidly growing human population on the others.
Why they're at risk
- !
The entire species existing in one location makes it catastrophically vulnerable to a single disease outbreak, natural disaster, or poaching wave.
- !
Arenga palm invasion is degrading the park's vegetation, reducing food availability for rhinos.
- !
Ujung Kulon sits near the Krakatau volcano — a major eruption or associated tsunami could affect the park.
- !
Inbreeding from such a small, isolated population is a growing concern.
Reasons for hope
- ✓
The population has grown from around 50 individuals a decade ago to approximately 76 today — slow but real progress.
- ✓
Camera trap monitoring covers the entire park, and every rhino is individually known to researchers.
- ✓
Efforts to clear invasive Arenga palms are actively expanding the rhinos' usable habitat.
- ✓
There are serious discussions underway about establishing a second wild population as an insurance against catastrophe.