Java and Bali
Javan Warty Pig (Sus verrucosus), Baluran National Park 2025
I visited Indonesia for the first time in June 2010: after a meeting in Jakarta I had a few free days to look around West Java before leaving for New Caledonia. I returned briefly to Jakarta in 2023 and went in search of bats with Carlos Bocos. And in 2025 I spent two days in East Java.
East Java
Sunda Pangolin (Manis javanica) near Baluran National Park, 2025
Alas Purwo National Park
East Javan Langur (Trachypithecus auratus)
An afternoon here in 2025 produced East Javan Langur, Long-tailed Macaque, Black Giant Squirrel, Banteng, Rusa and Wild Boar plus my target Javan Chevrotain at dusk.
Baluran National Park
Javan Warty Pig (Sus verrucosus)
During an afternoon in Baluran in 2025 we saw reintroduced Javan Warty Pigs, Lesser False Vampire Bats, East Javan Langur, Long-tailed Macaque, Plantain Squirrel and a feral Water Buffalo. That evening, close to the park, I saw several Lesser Bandicoot Rats (probably) and a superb encounter with my first Sunda Pangolin.
West Java
Javan Small-toothed Palm Civet, Arctogalidia trivirgata trilineata, Halimun Nationa Park, 2010
Gunung Gede National Park
Gunung Gede / Gede Mountain
In 2010 I saw Ebony (or West Javan) and Grizzled Langurs, Wild Boar, Javan Ferret Badger, Javan Mongoose, Horsfield’s Tree Shrew, Black Giant Squirrels, Sunda Black-banded (Black-striped) Squirrels and Three-striped Ground Squirrels.
West Javan Langur, Trachypithecus mauritius
There were Medium Bentwing Bats in a cave, Lesser Gymnure, Polynesian Rat, a Niviventer species, Common Palm Civet and an (introduced) Small Indian Civet
Halimun National Park
Silvery (Javan) Gibbon, Hylobates moloch
A night here in 2010 produced Javan Gibbons, Black-banded Squirrels, a Black Giant Squirrel and my first Black-eared Pygmy Squirrel. After dark we had Common Palm Civet and Javan Small Toothed Palm Civet (my photos of which accidentally helped to rediscover the species).
Javan Small-toothed Palm Civet, Arctogalidia trivirgata trilineata
We also saw a Malay (Stink) Badger, Red Giant Flying Squirrels, Pencil Tailed Tree Mouse and Javan Sunda Spiny Rats.
Jakarta
Javan Slit-faced Bat (Nycteris javanica), Bogor
In June 2023 I spent a night in Jakarta on my way home for a trip to West Papua. With Carlos Bocos’s help we saw a colony of Javan Slit-faced Bats at Bogor and, in the middle of Jakarta, we saw Short-nosed Fruit Bats, a Lesser Large-footed Myotis and Black Rats. I returned in 2025 and visited the Kawasan Arboretum Mangrove Walk, in the middle of the city, to look for the Greater Long-tongued Blossom Bats that I had missed in 2023. We saw blossom bats but were unable to photograph them to fully confirm they were indeed greater not lesser.
Community Reports
Baluran and Alas Purwo National Parks, 2025: Jon Hall, 2 days & 14 species including East Javan Langur, Javan Chevrotain, Javan Warty Pig and a Sunda Pangolin.
Bali & Timor Leste (diving with Blue Whales), 2024: Lennart Verheuvel, 26 days and 6 species in Bali including Javan Langur. And another 10 species in East Timor including Melon-headed Whales and superb underwater shots of Dugong and Blue Whales .
3 hours in central Java, 2024: Javan Wildlife Institute, 3 hours and 3 species including Javan Slow Loris and Javan Flying Squirrel.
Central Javan primate weekend, 2024: Stuart Chapman, 2 nights & 7 species including Javan Fuscous Leaf Monkey, Javan Slow Loris and Javan Flying Squirrel.
Siberut Island, Sumatra & Java, 2024: Ian Thompson, 3 weeks & 56 species including Pen-tailed Tree Shrew, Marbled Cat and Kloss’s Gibbons.
West and Central Java, 2024: Primavest, 1 week & 17 species including Javan Slow Loris, Javan Ferret Badger and Javan Fuscous Leaf Monkey.
Central & East Java, 2024: Primavest, 1 week & 18 species including Silvery (Javan) Gibbon, Javan Fuscous Leaf Monkey and Javan Chevrotain.
Sumatra & Java, 2023: Royle Safaris, 2 weeks & 42 species including Marbled Cat, Sumatran Orangutan and Javan Small-toothed Palm Civet.
Sumatra, Java & Bali, 2023: Royle Safaris, 17 days & 22 species including East and West Javan Langurs and Javan Small-toothed Palm Civet.
Gunung Halimun & Ujong Kulon, 2023: John Rogers, 2 weeks & 25 species including Javan Slow Loris, Grey-cheeked Flying Squirrel and Javan Leopard (plus the sounds of a Javan Rhino).
24 hours in Jakarta, 2023: Jon Hall, 1 night and 4 species including Javan Slit-faced Bat and Lesser Large-footed Myoti
Bali & Lombok, 2023: Jan Ebr, 2 weeks & 19 species including Javan Lutung, Horsfield‘s Treeshrew and Indomalayan Pencil-tailed Tree Mouse.
Bali, 2022: Paul Carter’s notes on seeing 12 species in Bali including Dugong, Geoffroy’s Rousette and East Javan Silvered Langur.
Gunung Gede, 2020: Hugh Lansdown, 4 days & 6 species including Javan Small-toothed Palm Civet.
Singapore, Java, Malaysia and Sumatra, 2019: Anita Ericson and Lars Petersson, 6 weeks & 63 species including – in Java – Spotted Giant Flying Squirrel, Javan Small-toothed Palm Civet and Javan Ferret Badger.
West Bali National Park, 2019: 4 days & 9 species including Javan Lutung, Black Giant Squirrel and Rusa Deer.
Sulawesi and Kerinci-Seblat, Sumatra (with a bit of Bali and Java too), 2018: Tomer Ben-Yehuda, 2 weeks & 30+ species including Babirusa and Bear Cuscus.
Ujung Kulong, 2018: Royle Safaris, 10 days & 19 species including Banteng and two Javan Rhinos!
Javan endemics, 2018: Royle Safaris, 6 days & 30 species including Javan Ferret Badger, Javan Gibbon and Javan Slow Loris.
Indonesia, 2016: Richard Webb, 2 weeks & 44 species including Western Tarsier, White-bearded Gibbon, Irrawaddy Dolphin and some nice bats.
Indonesia (Java, Sumatra, Sulawesi, Borneo and Bali), 2013: Dave Redfield and Richard White (INDRI tours), 22 days & 52 species including Pen-tail Treeshrew, Otter Civet and Mitred Langurs (all in Way Kambas, Sumatra).
Java & Sumatra, 2013: Richard Webb, 2 weeks & 38 species including all the Javan specialty primates and Javan Small-toothed Palm Civet, plus – on Sumatra – Banded Palm Civet, Flat-headed and Marbled Cats.
Java, 2012: Coke Smith, 12 days & 30 species including Banteng, Javan Palm Civet and a Javan Rhino!
Sulawesi, Sumatra and a bit of Java, 2012: Dominique Brugiere, 7 weeks & plenty of mammals including Babirusa, Sulawesi Warty Pig, Anoa, Banteng and Javan Ferret Badger.
Indonesia & Malaysia, 2011: Romain Bocquier, 6 weeks & 43 species including Marbled Cat and Sulawesi Dwarf Cuscus.
Javan Rhino Search & Taman Negara, 2011: Phil Telfer, 3 weeks & 28 species including Malaysian Tapir and the noise of a Javan Rhino.
Gunung Gede and Halimun NPs, 2010: Jon Hall, 4 days & 22 species including Silvery Gibbon, Sunda Stink Badger, Javan Ferret Badger and Javan Small-toothed Palm Civet.
Indonesia (esp. Sulawesi), 2009: Steve Anyon-Smith, 1 month & 20 mammals including Sulawesi Tarsier and Bear Cuscus.
Greater Sundas (West Malaysia, Borneo, Sumatra, Java), 2008: Tim Mitzen, 2 months and 55 mammals including a Sun Bear and Banded Palm Civet . A full trip report is here.
Also See
Checklist of the Mammals of Indonesia, March 2020
Indonesia Tips, November 2017
Javan Rhino Photographs, July 2017
Javan Rhino RFI, May, 2015
Javan Rhino footage, February 2015
Indonesia Rat ID help, August 2014
A few notes from Alas Purwo & Meru betiri from 2011, February 2025
Resources
A checklist for the mammals of Halimun National Park.
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