Hedgehog: Ecology, Urban Conservation, and Welfare

Hedgehog: Britain's Most Beloved Wild Mammal in Rapid Decline

The West European hedgehog (Erinaceus europaeus) is one of Britain's most familiar and best-loved wild mammals. Yet this iconic creature faces a serious population crisis: UK hedgehog numbers have declined from an estimated 30 million in the 1950s to fewer than 1 million today — a collapse of over 95% in 70 years. Understanding hedgehog ecology, the causes of decline, and how to help is a crucial wildlife welfare priority.

Ecology and Life History

Hedgehogs are nocturnal insectivores, foraging for beetles, earthworms, caterpillars, slugs, and other invertebrates over territories of 10-30 hectares (males) to 3-10 hectares (females) in a single night. They are solitary except during the breeding season (May-August). Hedgehogs hibernate from November to April, entering torpor to survive food scarcity and cold temperatures, relying on fat reserves accumulated during the active season.

Lifespan in the wild averages 2-4 years, though captive animals can reach 10 years. Annual survival is approximately 30-40%, with juveniles particularly vulnerable. Females produce 1-2 litters per year of 3-7 young; late-season litters (September-October) often fail to accumulate adequate weight for hibernation.

Urban Hedgehogs

Increasingly, urban and suburban gardens represent important hedgehog habitat as rural populations collapse. Urban hedgehogs have access to food (gardens, compost heaps) and nesting sites (log piles, compost heaps, under sheds) but face road collision risk, garden hazard exposure, and habitat fragmentation from impermeable fencing. Garden connectivity — enabling hedgehogs to move freely across multiple gardens — is the most important urban conservation measure.

Causes of Decline

• Agricultural intensification: Loss of hedgerows, reduced invertebrate prey, pesticide use, and improved grassland management remove habitat and food
• Badger competition: Increased badger populations in some areas reduce hedgehog survival through predation and competition
• Road traffic: Estimated 335,000 hedgehogs killed on UK roads annually
• Garden hazards: Strimmers, bonfires, garden netting, and ponds cause significant injury and mortality
• Fragmentation: Impermeable garden fencing prevents movement; isolated gardens cannot support populations
• Reduced habitat quality: Decking, artificial grass, and tidy gardens reduce foraging and nesting habitat

Conservation Actions

Hedgehog Street (BHPS/PTES partnership) promotes garden connectivity through 13cm x 13cm 'hedgehog highways' at the base of fences. Creating log piles, wild corners, and compost heaps provides nesting habitat. Leaving areas of rough grass for invertebrate prey. Never using slug pellets containing metaldehyde. Checking compost heaps before digging and bonfire sites before lighting.

Rehabilitation Welfare

Injured, sick, and underweight hedgehogs require specialist wildlife rehabilitation. Hedgehogs under 500g entering autumn hibernation require supplementary feeding to survive winter. Wildlife rehabilitation centres provide critical care for injured hedgehogs. Release back to appropriate habitat with ongoing garden monitoring optimises post-rehabilitation welfare.

This page is part of the Animal Welfare Hub — providing evidence-based information to improve the lives of animals. Return to home.