European Nightjar Welfare: Heathland Breeding and Light Pollution

Nightjars are crepuscular and nocturnal heathland birds whose welfare and breeding success are affected by habitat loss, light pollution that disrupts their insect prey hunting, and disturbance during the breeding season.

Key Facts

European nightjars are summer migrants to UK heathland, arriving in May and departing by October
They are amber-listed in the UK with a restricted heathland breeding distribution primarily in southern England
Nightjars hunt moths and beetles in flight using their enormous gape — prey availability depends on insect abundance
Their cryptic plumage and ground-nesting habit make them highly vulnerable to disturbance by people and dogs

Welfare Considerations

Nightjars disturbed on the nest by dogs or walkers abandon eggs and chicks that die rapidly from exposure without parental brooding. Their camouflage that protects them from visual predators provides no protection against scent-following dogs that can locate nests that human observers miss entirely. Light pollution at heathland edges reduces moth abundance by disrupting moth navigation, reducing prey availability for hunting adults and chick provisioning. Cats from nearby residential areas predate nightjars at nest sites on heathland edges. Forestry operations near nesting areas during May-August cause nest failure through direct disturbance and habitat destruction.

What You Can Do

Keep dogs on leads on heathland between May and September to protect ground-nesting birds including nightjars
Support RSPB heathland management that maintains open heath and scrub mosaic for nightjar nesting
Advocate for dark sky designations that reduce light pollution on heathland nature reserves
Participate in BTO Nightjar Survey to contribute population monitoring data