Brent Goose Welfare: Long-Distance Migration and Wintering Ecology

Dark-bellied brent geese (Branta bernicla bernicla) breed in Siberia and winter on UK estuaries, depending on eelgrass and saltmarsh vegetation for survival through winter.

Key Facts

Dark-bellied brent geese travel approximately 5,000km from Siberian breeding grounds to UK wintering sites
UK wintering population is approximately 100,000 birds concentrated on southern and eastern estuaries
Eelgrass (Zostera marina) wasting disease in the 1930s caused catastrophic population decline
Geese now exploit agricultural grassland when eelgrass is depleted, creating human-wildlife conflict

Welfare Considerations

Wintering welfare depends on energy balance — brent geese must maintain body condition through cold UK winters while preparing for spring migration. Disturbance from recreational activities and wildfowling on key estuaries displaces birds and increases energy expenditure. Lead ingestion from spent shot in estuarine sediments causes sub-lethal poisoning affecting body condition. Eelgrass restoration programs directly improve food availability and welfare for wintering birds.

What You Can Do

Support eelgrass restoration projects on UK estuaries to improve winter food availability for brent geese
Advocate for designation of key wintering estuaries as protected areas with disturbance management
Support the transition from lead to non-toxic shot in wildfowling to reduce lead poisoning
Report dead or sick geese showing neurological signs to the RSPB as potential lead poisoning cases