Island dims lights to save seabirds from light-driven deaths

Corvo Island in Portugal's Azores archipelago switches off public lighting for five nights each autumn to protect fledgling Cory's shearwaters during their migration to sea. The initiative, running since 2019, addresses a problem identified in 1991 when the island's 450 residents noticed mass mortality among young seabirds drawn to artificial lights instead of navigating by starlight.

The mechanism is straightforward: artificial lighting disorients fledglings attempting their first flight to the ocean. They collide with infrastructure, exhaust themselves, or perish before reaching water. By darkening the island during the critical fledging window, Corvo reduces these deaths substantially.

What makes this noteworthy is the scale of community commitment. An entire inhabited island – not a protected reserve – deliberately dims itself for wildlife. This isn't a corporate sustainability pledge or government mandate. It's a local population recognising ecological damage and acting without external pressure.

Cory's shearwaters are endemic to the Atlantic; their breeding population depends on spaces like Corvo. Light pollution affects seabirds globally – studies document similar die-offs near airports, cities, and coastal developments. Yet most jurisdictions treat this as an acceptable trade-off.

The Azores initiative suggests otherwise. Five nights of darkness costs the community measurably – street safety, commercial activity, tourism – yet they've sustained it for five years. The question now is whether this model scales. Can other island communities, or coastal towns near breeding grounds, adopt similar blackout periods? And should marine conservation planning include mandatory lighting protocols as standard practice, rather than voluntary exception?

Lights out: the island that goes dark to save young seabirds – in pictures

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