European storm petrels are tiny oceanic seabirds nesting in rock crevices on uninhabited islands, vulnerable to introduced predators and light pollution.
Introduced cats and rats predate adults and chicks at night causing severe losses. Light pollution attracts fledglings that become grounded and unable to relaunch. Grounded birds are vulnerable to exhaustion, dehydration, and predation by domestic animals. Storm petrels that lose mates show prolonged periods of reduced breeding activity. Cats on islands can kill hundreds of birds per night during breeding season.