nature & planetMongabay

A plan to save Bali’s vanishing fireflies takes root in organic farming

the gist

Fireflies that once lit Bali's rice fields in clouds have virtually vanished from many villages, victims of land development, light pollution, habitat degradation and heavy pesticide use. At least four firefly species in Southeast Asia are nearing extinction. That matters beyond nostalgia: fireflies indicate environmental health, pollinate some plants and prey on crop-eating snails. Bring Back the Light, founded in 2020 on a family farm in Taro, runs Indonesia's only firefly conservation programme, raising larvae for up to two years in terrariums that mimic jungle and wetland and releasing about 90% of adults. It has released nearly 20,000 larvae and adults and local counts are slowly recovering, but breeding alone can't work without healthy habitat, so organic farming is central.

how it works

Firefly larvae live in wet soil or water and eat snails, so they need clean ground and little pesticide. Adults signal to mates with light, which artificial lighting disrupts.

so what

Fireflies are a gauge of whether an ecosystem still works, because their larvae need clean, damp, dark habitat. Cutting pesticides and lights is as important as captive breeding.

fun fact

Firefly light is produced by a chemical reaction that gives off almost no heat.

Mongabay · CC BY-ND 4.0

Illustrative photo · Bruce Marlin, CC BY-SA 2.5, via Wikimedia Commons