Waterfalls & Nature
Jungle ecosystems and wildlife of the interior
Koh Samui's interior holds secondary forest on the lower slopes and rare primary rainforest around Khao Pom. Reported wildlife includes dusky langurs, long-tailed macaques, oriental pied hornbills, giant squirrels, monitor lizards and many butterflies.
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The story
Koh Samui's jungle is not one single forest. Most lower-elevation forest is secondary growth - it regrew after land was cleared for coconut plantations decades ago. Around Khao Pom, the island's highest mountain, primary rainforest survives: never commercially logged, with trees 30-40 m tall, multi-layered canopy, and branches loaded with orchids, ferns and mosses.
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Local trekking guides report wildlife including dusky langur monkeys (early morning, mid-canopy), long-tailed macaques near plantations, oriental pied hornbills (their wing beats are audible), raptors above the canopy, giant forest squirrels, monitor lizards on lower slopes, and spectacular butterflies, millipedes and stick insects. Practical cautions for visitors: leeches are present on upper slopes during and after rain (harmless but unpleasant - long trousers tucked into socks and repellent help); and Thailand's snakes include the Malayan pit viper, which lies still under leaf litter - wear closed shoes, watch where you step, and stay on cleared paths. The forest is a living watershed, so do not litter, do not feed monkeys, and keep noise down.
Birdwatching is best at dawn.
Good to know
- Daylight
- Free
- Dawn for birds and monkeys; Dec-Feb for fewer leeches
Check before you go · last checked 25 Sept 2026 · 3 sources
Sources and last check
- Last checked
- 25 Sept 2026
- What was checked
- Details checked 25 Sept 2026
- Next check due
- September 2027
Official sources
No official source published yet for this page.
Plus 3 other references and local research.