A third of the Javan rhino’s population disappeared from Ujung Kulon National Park before anyone noticed. Here’s the fuller story, and what’s actually left to protect.
This month’s Anak Krakatau eruption made headlines for grounding flights and stranding travellers across Indonesia. A few kilometres across the Sunda Strait, it also drew attention back to Ujung Kulon National Park, the only place on Earth where the Javan rhino still survives. The volcano spared the park again, as it did in 2018. The rhinos were never really the ones at risk from Krakatau. The bigger threat had already happened, and almost nobody outside conservation circles noticed until it was too late to stop.
One park, one population, and a poaching scandal nobody saw coming
The Javan rhino once ranged across mainland Southeast Asia and the island of Sumatra. By the twentieth century, hunting and habitat loss had reduced it to two isolated populations: one in Ujung Kulon, at the western tip of Java, and a small, non-viable group in Vietnam, which was declared extinct in 2011. Since then, every Javan rhino alive has lived inside a single national park, on a single peninsula, at the far end of a volcanic island chain.
For most of the past decade, that story was framed as one of quiet recovery. Camera traps and ranger patrols had tracked the population climbing from around 40 animals in 2009 to a widely cited figure of roughly 76 by the early 2020s, helped along by decades of anti-poaching Rhino Protection Units and a years-long project to clear an invasive palm species that had choked off much of the rhinos’ food supply. It looked, cautiously, like a conservation success story.
In May 2023, park rangers reported four missing camera traps to police in Indonesia’s Banten province. Footage recovered from nearby cameras showed armed men moving through the park, and further digging by investigators traced the activity to two organised poaching gangs, allegedly operating with inside knowledge of rhino movements passed along by a former park patrol member. The scale of what the investigation uncovered went far beyond a single stolen camera. Convicted poachers eventually confessed to killing as many as 26 rhinos, close to a third of the entire species, in a run of killings stretching back to 2018 that official population counts had somehow never registered.
The prosecutions that followed delivered some of the longest wildlife-crime sentences Indonesia has ever handed down, with convictions and jail terms running through 2024 and 2025. They also exposed a harder problem: for years, rhinos were quietly vanishing from camera-trap records while government population figures kept reporting stability.
A stolen camera trap, of the kind used across Ujung Kulon’s monitoring network, is what first exposed the poaching. Photo: WWF
What’s left, and why a second population is still contested
Current estimates put the Ujung Kulon population at somewhere around 50 animals, though precise counts remain genuinely difficult for a species this elusive; even rangers who patrol the park daily can go months without a direct sighting, relying on footprints and dung between camera-trap images. The one clearly positive thread running through the past few years is reproduction: new calves have been recorded most years since the poaching came to light, including sightings in 2021, 2023, 2024 and 2025, evidence that the population can still grow if the killing genuinely stops. The protection infrastructure behind that hope isn’t new, and it isn’t cheap: the International Rhino Foundation has funded Ujung Kulon’s Rhino Protection Units for close to two decades, and the park now runs a monitoring network of well over a hundred camera traps across dozens of clusters, alongside habitat-restoration work by WWF-Indonesia and Yayasan Badak Indonesia to reclaim rainforest choked by invasive palm. None of it guarantees the species survives. All of it is the reason the population hasn’t already gone to zero.
Long before this year’s poaching case, conservationists were already uneasy about keeping an entire species in one park. Calls to establish a second wild population elsewhere date back decades, and the logic hasn’t changed: a single tsunami, disease outbreak or catastrophic eruption could still wipe out the species in one event, exactly the scenario this month’s Krakatau eruption briefly raised again before the ash cleared without a wave. Some conservation groups still call it the ultimate long-term goal; others argue the immediate crisis makes splitting an already-reduced population too risky, and that security has to come first. Neither debate has a clean answer yet.
Visiting Ujung Kulon
None of this makes Ujung Kulon a rhino-spotting destination, and it was never meant to be one. Visitors won’t see the animals; Javan rhinos actively avoid people, and even trained rangers rarely encounter them directly. What the park does offer is genuine, low-impact access to the habitat itself: jungle trekking, snorkelling and island-hopping around Peucang Island, reached by boat charter from Carita Beach or overland via Tamanjaya village. Entry permits and guides are arranged directly through the national park office, which is also the right point of contact for current access given this month’s volcanic activity. Every visitor fee and every guided trip through Tamanjaya feeds, in a small way, into the same park budget that funds ranger patrols and camera-trap upkeep. It’s a quieter form of support than a donation drive, but a real one.
Ujung Kulon’s protection depends on patrols like this one running every day, not just when a crisis makes headlines. Photo: International Rhino Foundation
Anak Krakatau’s eruption this month was real news, and it genuinely could have gone worse for Ujung Kulon than it did. But treating the volcano as the Javan rhino’s defining threat this year gets the story backwards. The species has already survived something far more sustained and far harder to see coming: a poaching operation that ran for five years inside one of the most closely monitored conservation sites in Southeast Asia before anyone caught it. What’s left of the Javan rhino is still standing because of unglamorous, expensive, daily protection work, not because the volcano happened to spare it twice. That work isn’t finished, and it doesn’t get easier just because the ash has settled.
Further Reading
- The Animal Nobody Has Seen: Inside Laos’s Bid to Save the Park It Barely Shows Anyone – Laos’s saola faces the same single-population risk as the Javan rhino, covered from another angle.
- Borneo: The Greatest Island Wildlife Sanctuary Where Your Money Funds Conservation Efforts – the same community-funded conservation model behind Ujung Kulon’s protection work.
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