15 April 2026

Wild Siberut: Eleven Days, Four Primates, Seventy-Two Birds

All four Siberut primates seen in our exploration. Fom left to right bilou simakobu, bokoi and joja

With a ‘clean sweep’ of all four Siberut primates, my 11 days journey with Heru Fitriyadi to Siberut Island, Mentawai Islands, West Sumatra, is so astonishing. Joja the Siberut Langur and simakobu Pig-tailed Langur, seen in Southwest Siberut. In South Siberut, we saw bilou Kloss’s Gibbon. While in North Siberut, all four of them, include bokoi or Siberut Macaque, the hardest one.

To complete, a group of Long-tailed Macaque and five other mammals sum up to total of at least 9 mammal species in our list, and 72 species of birds seen. So, please follow the link to Swaraowa website (https://swaraowa.org/wild-siberut-eleven-days-four-primates-seventy-two-birds/) for the complete story.

 

 

 

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Imam Taufiqurrahman
Wildlife enthusiast. Living in Java, Indonesia
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5 Comments

  • 16 April 2026
    blackwatch.

    Wow the pictures of the monkeys look amazing and so do all the other pictures.

  • 17 April 2026
    Jon Hall

    Great report Imam! Thanks. I must get over to those islands with Heru

  • 25 April 2026
    Daan Drukker

    Beautiful report! The picture that is captioned as “Mentawai Flying Squirrel” is actually a Siberut Flying Squirrel, based on the dark belly and the ear shape. I’m working on a manuscript about these flying squirrels and I should continue with my trip report as well of our trip!

  • 25 April 2026
    Jacob Zinn

    Awesome report! With your permission, could we use the photo of the bokoi for our species profile? Right now, we are using a photo of a southern pig-tailed macaque: https://neprimateconservancy.org/siberut-macaque/

    • 28 April 2026
      Jon Hall

      Hi Jacob. Heru says it’s fine for you to use the picture. I’m trying to get you the original if you need it – if you don’t hear from me please email me and I can connect you with Heru… not easy keeping on top of stuff while I’m on the road.

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