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JAKARTA: It was deep in the heart of an Indonesian rainforest in West Java that Rahayu Oktaviani, known as Ayu, first heard the “song” of the Javan gibbon. 

She had her first encounter in 2008 while visiting the Mount Halimun Salak National Park for an undergraduate research project that required her to obtain a voice sample of the primate. 

After waiting patiently for two weeks, coming in and out of the forest, she finally heard a Javan gibbon make its distinctive call. 

She recalled how the sound she described as melodic and haunting had created a hush, as it echoed throughout the forest. 

“It’s like the most beautiful song that I ever heard in my life. It’s so amazing,” Ayu told Arab News. 

“They are non-human primates, but they can have like this beautiful song that can make all of … the creatures in the forest just keep silent.” 

In the 17 years since, Ayu has dedicated her life to protecting the endangered animals, which are also known as “silvery gibbon,” or “owa jawa” locally.

A vast archipelago stretching across the equator, Indonesia is a top global biodiversity hotspot and home to over 60 species of primates, about 38 of which are endemic to the country. 

“Maybe a lot of people know about the orangutan, about the rhino, about the tiger, but how about the overlooked species, just like, for example, the Javan gibbon? Not so many people know about them,” Ayu said.  

Fewer than 2,500 Javan gibbons remain in the wild today, according to an estimate by the International Union for Conservation of Nature. About half of them live in the 87,000-hectare Mount Halimun Salak National Park, where Ayu and her team have laid the building blocks for grassroots conservation of the endangered species. 

The gibbons rely on a continuous canopy for movement and foraging, making them particularly vulnerable to forest fragmentation and habitat degradation. As around 55 percent of Indonesia’s 270 million population lives in Java, the survival of the endemic species found only in the island’s forests is threatened by deforestation and illegal animal trafficking. 

“With the situation in Java, where only like 10 percent of the natural forests are remaining, it means the forest itself should be intact. The forest itself still needs to be there not only for the Javan gibbons, but also for the other species that need this habitat for their lives,” Ayu said. 

In 2020, she co-founded the conservation nongovernmental organization Kiara to expand efforts to save the Javan gibbon, believing that a key aspect in protecting the species was to engage the local community. 

When she started out as a primatologist, spending much time in the forest to study the gibbons, Ayu did not realize that she was neglecting the very people who lived alongside the primates. 

She recalled a question a villager posed at the time, a woman named Yanti, who was curious as to why Ayu always went to the forest but rarely stopped by the village. 

“That’s a really casual and simple question, but it kept me thinking about what I’ve been doing so far. Is there something that I’ve been missing?” Ayu said. 

Yanti’s query eventually led her to realize that she needed to do more with the community. 

“We want to build together with the communities, where actually the gibbon can be something that they can be proud of,” she said. “Community engagement is 100 percent the core for conservation because without community, we cannot do everything.” 

Ayu has employed people from Citalahab, a small village enclave located within the national park where locals make a living working in tea plantations or as rice farmers. Eight of them now work in the field alongside Ayu and her team to monitor the gibbons in the wild. 

With Kiara, she also established the Ambu Halimun initiative, which involves 15 local women between the ages of 17 and 50 in ecoprinting workshops and financial literacy training. 

In April, Ayu won the prestigious Whitley Award, which recognizes achievements in grassroots conservation, to advance her work in protecting the Javan gibbons. 

With 50,000 British pounds ($67,000) from the award, Ayu plans to scale up her programs with Kiara to mitigate threats from human activities and to protect the gibbons’ habitat. 

This includes developing a data management system to enhance park-wide conservation efforts, training the park rangers in biodiversity monitoring techniques, and guiding conservation strategies. 

The 38-year-old, whose role models are “the Trimates,” primatologists Jane Goodall, Dian Fossey and Birute Galdikas, has faith that humans can live in coexistence with wildlife. 

“Actually, if we put aside our ego, we are part of the ecosystem itself. We are not separated from the ecosystems, so it means we have to have more balance with nature,” she said. “And to do that, we also have to respect what else (is) actually living together with us in these ecosystems.” 

Ayu said the Whitley Award served as good momentum to raise awareness about the species she loves dearly, the Javan gibbons. 

“I believe not so many people are aware of the existence of the Javan gibbon, so it’s the right momentum to share the love for the Javan gibbon and make people care about it,” she said. “Because how can you care about the species if you know nothing about them?”

With the award and the coverage that it garnered internationally, Ayu is also hopeful about inspiring a new generation of conservationists from Indonesia. 

“I think women also play a good part to be conservationists in the future … It’s also about … regeneration: the importance of nurturing the new generation of conservationists and primatologists from Indonesia, especially because we need more and more people who work in this field.”