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Gomantong Cave stands out for insect-exploration due to its colossal guano mound, product of millions of bats and swiftlets, that sustains billions of cockroaches, scorpions, centipedes, and beetles in a pulsating underground ecosystem. No other accessible cave matches this scale of entomological biomass, where the floor writhes like a living entity. Visitors wade through this bug-choked wonder via boardwalks, confronting nature's recyclers in raw form.
Core experiences include circling the cockroach-infested boardwalk in Simud Hitam Cave, scanning guano piles for scorpions and predators, and observing insect hordes during the evening bat exodus from the cave mouth. Venture to Simud Putih for rarer nest-linked bugs during harvest seasons. Forest trails outside yield butterflies, leafbirds, and hornbills amid the insect backdrop.
Dry seasons from February to September offer optimal conditions with lower humidity, though expect intense ammonia stench and slippery paths year-round. Prepare for 200+ steep stairs to the entrance and 30–60 minute boardwalk loops. Entry costs MYR 5 for foreigners; Sabah Wildlife Department manages access from 9 AM to 4:30 PM.
The Orang Sungai community has harvested swiftlet nests here for centuries, regulating collections under Sabah Wildlife Department oversight to sustain the cave's ecosystem. This ties insect abundance to cultural practices, as guano-fueled bugs support the birds whose nests fuel local economy. Insiders tip lingering at dusk for the full insect-bat-swiftlet interplay.
Plan visits during nest-harvesting in February, April, July, or August for maximum insect activity tied to swiftlet and bat cycles. Book guided tours from Sandakan via operators like Bilit Rainforest Lodge to include transport and entry fees of MYR 5–10. Avoid midday heat; aim for 4–6 PM to catch the bat exodus amplifying insect swarms.
Wear closed shoes and tuck pants into socks to minimize cockroach and centipede contact on the slippery, guano-smeared boardwalk. Bring a headlamp for peering into crevices teeming with scorpions and beetles, plus insect repellent for the forest trail. Move steadily to avoid stirring aggressive swarms, and carry hand sanitizer for post-visit cleanup.