Hedgehog Population Decline: Conservation, Welfare, and How Gardens Can Help

UK hedgehog populations have declined by over half since 2000. Understanding the causes and responses to this decline guides practical conservation and welfare action.

Key Facts

UK hedgehog populations have declined from an estimated 30 million in the 1950s to fewer than 1 million today — one of the most dramatic population collapses of any British mammal
Road mortality kills an estimated 100,000-200,000 hedgehogs annually — roads fragment hedgehog ranging habitat and create impassable barriers to movement
Habitat loss including loss of hedgerows, field margins, and garden connectivity reduces foraging habitat and winter hibernation site availability
Badger predation is a factor in some areas — research is contested but evidence suggests it is not the primary driver of national decline
Metaldehyde and methiocarb slug pellets kill hedgehogs directly — ferric phosphate products are safer alternatives with equivalent efficacy
Garden connectivity — hedgehog highway gaps between gardens — is a highly practical conservation intervention that allows hedgehogs to range across connected urban habitat
Hedgehog Street is a Hedgehog Preservation Society initiative connecting garden-based conservation action with citizen science data on hedgehog population and movement

Welfare Considerations

The welfare dimension of hedgehog decline is both individual and population-level. Individual hedgehogs killed on roads or poisoned by slug pellets experience acute suffering. The population-level decline represents a welfare catastrophe in that it eliminates future hedgehog lives that would otherwise be lived. Fragmentation of hedgehog habitat by roads and impermeable garden boundaries causes welfare harm through increased road crossing attempts and the chronic stress of inability to meet ranging and foraging needs in a disconnected landscape. The connection between individual garden actions — creating highway gaps, removing slug pellets, checking for hibernating hedgehogs before disturbing garden piles — and population-level conservation outcomes makes hedgehog welfare one of the most tractable wildlife welfare problems for individuals to act on.

What You Can Do

Cut a 13cm by 13cm hole at ground level in the base of your garden fence to allow hedgehog access — this single action expands available foraging habitat significantly
Stop using any slug pellets — switch to ferric phosphate products, physical barriers, or companion planting that reduces slug damage without killing hedgehogs
Check compost heaps, leaf piles, and bonfires for hibernating hedgehogs before disturbing them — hedgehogs hibernate from November to March
Provide supplementary food (cat or dog food, not milk or bread) and fresh water particularly in spring and autumn when natural food is scarce
Register your garden with Hedgehog Street to contribute to population monitoring and connect with local conservation networks
Support British Hedgehog Preservation Society campaigns for traffic calming near known hedgehog crossing points and improved road ecology design
Report hedgehog sightings and road casualties to the Big Hedgehog Map — citizen science data drives evidence-based conservation responses