Wildlife

House Sparrow: Urban Decline and the Welfare of City Birds

House sparrows have declined by 71 percent in UK towns and cities since 1977, raising significant welfare concerns about urban wildlife.

Key Facts

UK urban house sparrow populations fell by 71 percent between 1977 and 2015
The reasons for decline include loss of nest sites, food, invertebrates, and increased predation
House sparrows are highly social and live in loose colonies
They need dust-bathing sites and access to insect-rich vegetation to raise chicks
London lost over half its house sparrows between 1994 and 2004

Welfare Considerations

House sparrows in cities suffer from modern building practices that seal off eaves and gaps used for nesting. Clean street environments reduce the weed seeds and invertebrates that feed adults and chicks. Increased cat predation in suburban gardens adds mortality pressure. Social disruption occurs when colonies are fragmented by development.

What You Can Do

Install purpose-built house sparrow terraced nest boxes under eaves
Leave patches of weedy vegetation in gardens for insect and seed foraging
Support campaigns for building regulations requiring nest site provision in new buildings
Keep cats indoors during the nesting season from April to August
Join RSPB garden bird surveys to help track urban sparrow populations