Indonesia Races to Save the Last Wild Bornean Rhino Through Assisted Reproduction

• Biodiversity

Indonesia Races to Save the Last Wild Bornean Rhino Through Assisted Reproduction

Indonesia has launched an urgent conservation mission to save the Bornean rhino, one of the world’s rarest mammals. Conservationists are working to locate and capture Pari Mahulu, the last known Bornean rhino still living in the wild, in an effort to preserve her genetic material through assisted reproductive technologies before this unique subspecies disappears forever.

The operation represents one of the most ambitious wildlife conservation projects currently underway. Rather than relocating the animal for exhibition or captivity, scientists hope to collect viable eggs that can be used in advanced breeding programs. With natural reproduction no longer considered a realistic possibility, biotechnology may provide the only remaining chance to preserve the Bornean rhino’s genetic legacy.

Only Two Bornean Rhinos Are Known to Survive

The conservation outlook for the Bornean rhino is extremely grim. Only two individuals are known to remain alive: Pahu and Pari Mahulu, and both are females. Pahu currently lives under constant veterinary supervision at the Kelian Rhino Sanctuary in East Kalimantan, while Pari Mahulu continues to roam the forests of Mahakam Ulu, where her presence has been confirmed through camera traps.

The absence of any known male effectively eliminates the possibility of natural breeding. Even if an undiscovered male still exists somewhere in the rainforest, years of habitat fragmentation have isolated the remaining rhinos into small, disconnected populations, making encounters highly unlikely.

The Bornean rhino is classified as a subspecies of the Sumatran rhinoceros (Dicerorhinus sumatrensis harrissoni). This close genetic relationship offers scientists a potential solution: using sperm collected from Sumatran rhinos to fertilize eggs harvested from Pari Mahulu through assisted reproductive techniques.

Why Assisted Reproduction Is the Only Remaining Option

Indonesia’s Ministry of Environment and Forestry has identified assisted reproduction as the best opportunity to preserve the subspecies. The plan involves safely capturing Pari Mahulu, transporting her to a specialized conservation facility, and collecting mature eggs for laboratory fertilization.

Scientists intend to fertilize these eggs using sperm from genetically compatible Sumatran rhinos. If healthy embryos are produced, they could eventually be implanted into a surrogate female capable of carrying the pregnancy to term.

The government’s reproductive strategy extends beyond conventional in vitro fertilization (IVF). It also includes intracytoplasmic sperm injection (ICSI), genetic biobanking to preserve reproductive material, and research into cloning technologies as additional tools for long-term conservation.

According to Indonesian authorities, collected eggs must reach the laboratory at IPB University within 24 hours to maximize their viability for fertilization and embryo development.

Leaving the Rhino in the Wild Is No Longer Enough

While many people instinctively believe endangered animals should remain in their natural habitat, conservation experts argue that doing so in this case could ultimately lead to extinction. Without a breeding partner, Pari Mahulu cannot contribute to the survival of her subspecies regardless of how well protected the surrounding forest may be.

Decades of logging, agricultural expansion, mining, and infrastructure development have fragmented the tropical rainforest into isolated patches. As a result, surviving rhinos often live completely alone, separated by distances too great to allow successful reproduction.

Officials in East Kalimantan have emphasized that capturing Pari Mahulu does not mean abandoning conservation efforts in her native forest. On the contrary, authorities intend to continue protecting the region and strengthen its conservation status to preserve biodiversity and remaining wildlife habitats.

A Highly Complex Capture Operation

Capturing an adult rhinoceros is one of the most challenging wildlife operations conservation teams can undertake. Rhinos are large, powerful animals that are highly susceptible to stress, making every stage of sedation, transport, and recovery potentially dangerous.

To minimize these risks, Indonesian conservation teams have spent months rehearsing every aspect of the operation. Simulations using livestock of similar size have helped veterinarians refine capture techniques, transportation procedures, emergency responses, and post-capture medical care.

The planned mission includes aerial transportation to a specialized conservation center, followed by approximately three months of quarantine inside a protected enclosure known as a “boma.” During this period, veterinarians will closely monitor Pari Mahulu’s health before beginning any reproductive procedures.

The Entire Sumatran Rhino Species Faces Extinction

The plight of the Bornean rhino reflects the broader crisis affecting the Sumatran rhinoceros. According to the International Rhino Foundation, fewer than 80 Sumatran rhinos survive today, while estimates from the International Union for Conservation of Nature (IUCN) suggest there may be only 34 to 47 reproductively viable individuals remaining.

Organizations including WWF and Save the Rhino warn that habitat loss is now only part of the problem. Small, isolated populations suffer from declining genetic diversity, reduced breeding opportunities, and increasing risks associated with inbreeding. Even when animals survive, they often remain too far apart to reproduce naturally.

These biological limitations make advanced reproductive technologies increasingly important for preventing extinction.

A Race Against Time

The immediate priority is locating Pari Mahulu and carrying out the capture under the safest possible conditions. Once she reaches the conservation facility, veterinarians will conduct comprehensive health evaluations before attempting to retrieve viable eggs.

From there, the project enters its most delicate phase. Egg collection, laboratory fertilization, embryo development, and eventual implantation into a surrogate female all carry significant scientific challenges. Any stage could fail, but each successful milestone would represent a major breakthrough for wildlife conservation.

If Pari Mahulu dies before her genetic material can be preserved, an irreplaceable branch of rhinoceros evolution will disappear forever. Scientists are therefore racing not only to save a single animal, but also to preserve thousands of years of unique evolutionary history.

The Bornean rhino has become a powerful symbol of both the consequences of habitat destruction and the growing role of science in modern conservation. While assisted reproduction cannot replace healthy ecosystems, it may offer the last realistic opportunity to prevent the complete loss of one of Earth’s most extraordinary mammals while broader efforts continue to protect Southeast Asia’s remaining rainforests.