Primata Endemik Mentawai, Jembatan Rusak, dan Janji Kemerdekaan

Addy Mukhziae, Rizaldi 

Primate Conservation Education Program

The condition of the Saibi Samukop Bridge in an Instagram post by the West Sumatra Mentawai Student Forum (@formmasumbar)

Rare as it's become, we still occasionally catch the call of the bilou, an endemic Mentawai gibbon, likely swinging somewhere deep in the forest canopy. That piercing call can travel up to two kilometers, a territorial mechanism the species has carried through hundreds of thousands of years of evolution. One afternoon, in the middle of tracking down that endangered primate, our phones lit up with a notification from the Mentawai Student Forum of West Sumatra: a post about the Saibi Samukop Bridge, which had collapsed during an ecological disaster back in December 2025 and, as of that day, still hadn't been repaired.

Two things that seem entirely unrelated. But to anyone who's spent real time working in the field in Mentawai, they're part of the exact same problem.

Primates Found Nowhere Else on Earth

The Mentawai Islands are one of the most singular biodiversity hotspots anywhere in the world. Separated from mainland Sumatra more than 500,000 years ago during the Pleistocene, the islands underwent an isolated evolutionary path that produced wildlife found nowhere else on the planet.

Six endemic primate species call these islands home: the bilou (Hylobates klossii), simakobu (Simias concolor), joja (Presbytis siberu), atapaipai (Presbytis potenziani), siteut (Macaca pagensis), and bokkoi (Macaca siberu). Every one of them appears on the IUCN Red List, the international authority on species conservation status, ranging from threatened to critically endangered. That means if their habitat here disappears, there's no backup population anywhere else on the planet. Extinction in Mentawai means extinction, full stop.

The biggest threat isn't anything new: deforestation. Most of it traced back to corporations operating under environmental impact assessments treated as little more than paperwork rather than genuine scientific guidance, and that paperwork keeps chipping away at what habitat remains. What makes it worse is that logging often arrives hand in hand with the promise of new roads. Roads get built, forests get carved apart, and local communities, who were never truly given a say in any of it, suddenly find themselves facing an ecosystem that's changed for good.

An Old Misunderstanding: Treating Conservation as Development's Enemy

So why would a collapsed bridge have anything to do with conservation? This is exactly where the relationship between the two tends to get misread.

Wildlife conservation is often painted as anti-development, as if protecting the forest means leaving local communities behind. That perception isn't just logically flawed, it's genuinely harmful, because it pits two things against each other that should really be moving forward together.

Over seven months moving between villages across Mentawai running this conservation education program, we saw firsthand just how tightly the two are actually locked together. The collapsed Saibi Samukop Bridge was never just an infrastructure story. For as long as it stayed broken, children on the other side lost their regular route to school, teachers struggled to reach their classrooms, and the local economy that depended on that crossing ground to a halt. We lived through it ourselves too: nights without electricity that cut into children's study time, and stretches with no signal at all that severed people's access to information from beyond the island.

That experience revealed a pattern that kept repeating. When basic infrastructure, roads, bridges, electricity, cell signal, falls short, access to education suffers right along with it. When education suffers, people's understanding of the ecological and economic value of the natural resources around them struggles to take root. And when that understanding never takes root, the forest becomes easier to see as nothing more than land waiting to be converted, rather than a living asset worth far more left intact. Uneven infrastructure isn't some issue sitting off to the side of conservation. It's one of its root causes.

Flipping the Script: Primates as an Asset, Not Just Something to Protect

There's a mindset here that needs to be turned on its head.

Mentawai's endemic primates aren't just creatures in need of protection. Within a sustainable economic framework, they're an almost priceless tourism asset, precisely because their endemism is absolute. Anyone who wants to see a bilou in the wild has exactly one option anywhere on the planet: come to Mentawai.

Primate-based ecotourism has already proven itself across the world. In Rwanda, the mountain gorilla (Gorilla beringei beringei) program generates substantial revenue that sustains conservation efforts while delivering direct benefits to local communities. In Kalimantan, orangutans (Pongo pygmaeus) draw enough tourism to make forest conservation pay for itself. Mentawai has that same potential, arguably an even stronger one, since it offers six endemic primate species at once within a single ecosystem.

But that potential can only become real if two conditions are met: the forest habitat has to still be standing, and the people managing it need enough capacity and self-determination to run that industry and keep its rewards for themselves. Both conditions depend on decent infrastructure and education. This is exactly the point where "sustainable development" stops being an abstract phrase buried in a policy document and becomes a concrete choice: burn through a resource once, or manage it as a long-term asset that keeps paying off.

Who Really Gets to Decide the Fate of Mentawai's Forests?

Behind all the figures and data sits a more fundamental question: who actually has the right to decide what happens to Mentawai's forests and natural resources?

Mentawai's indigenous communities have lived alongside this forest for thousands of years. Their body of local knowledge, about seasons, about species, about the boundaries of customary land, functions as an ecological "archive" built from experience passed down across generations. Conservation science calls this traditional ecological knowledge, or TEK, and it's increasingly recognized as a vital complement to conventional scientific approaches, not folklore to be dismissed as less rigorous.

But that knowledge can't survive being pushed to the margins. When young people in Mentawai don't get adequate access to education, when there's no infrastructure in place to let them put local potential to work on their own terms, when customary rights keep eroding without solid legal protection, what's at risk isn't just the primates. It's the entire knowledge system that has kept the balance in place all along.

Real conservation can't function without social justice. The two were never meant to be weighed against each other; they're two sides of the same coin.

That responsibility can't rest on public awareness alone. Policymakers are obligated to genuinely enforce the laws already written to protect indigenous communities, forests, small islands, and natural resources sustainably, rather than quietly looking the other way for illegal loggers dressed up as development investors. The outdated view of forests as vacant, unused land needs to be corrected through education that's both systematic and genuinely on the side of the people who live there. TEK, which has kept ecosystems in balance for centuries, deserves recognition and protection not just as a living practice, but as intangible cultural heritage and collective intellectual property belonging to indigenous communities: a civilizational asset carrying legal, scientific, and cultural value no less significant than any patent or copyright.

A Promise Still Unpaid

Indonesia's constitution mandates that the state protect the entire nation and all its people, and work to advance the common welfare. In Mentawai, one part of that nation and its land, that common welfare can't be separated from the survival of its wildlife and their habitat. People, primates, and the forest that sustains them both are bound together in a single fate. Sacrificing any one of them betrays the whole mandate.

And that mandate remains unfulfilled. The Mentawai Islands stand as a reminder that independence, in its truest sense, still hasn't reached everyone equally. Advancing the nation's intellect and building social justice for all of Indonesia's people aren't ceremonial phrases, they're a measurable standard: how adequate the infrastructure actually is, how far education can genuinely reach, how much real control local communities hold over the resources on their own land. The Saibi Samukop Bridge, still lying in ruins to this day, is one honest answer to that question.

A bilou calling out at dawn in Mentawai's canopy knows nothing about constitutions or development policy. But whether it continues to exist, or eventually falls silent for good, will be one of the most honest answers we have to a single question: how seriously are we actually keeping that promise?

Above everything else, the greatest hope is that this awareness grows from within Mentawai itself. Because it's the people there who face these imported hardships every single day, hardships that always seem to end up benefiting a handful of elites far from the islands. Not an awareness handed down or taught from a distance, but one born of lived experience, of love for their own land, and of understanding that what exists in Mentawai belongs to them: to protect, to manage, and to pass on entirely by their own will.

(CE © 2026)