Wildlife Corridors and Animal Movement: Reducing the Welfare Cost of Habitat Fragmentation

Habitat fragmentation forces wild animals to cross roads, fences, and developed land that kills millions annually and causes chronic stress in isolated populations. Wildlife corridors are a proven intervention that reduces these welfare costs while supporting conservation.

Key Facts

An estimated 1.3 million large animals are killed on roads in the United States every day, with many more injured and dying slowly
Road mortality is a leading cause of death for large carnivores, deer, hedgehogs, badgers, and many reptile species worldwide
Animals in fragmented habitats show elevated cortisol levels, reduced genetic diversity, and higher rates of inbreeding-related health problems
Wildlife crossing structures including overpasses, underpasses, and tunnels reduce road mortality by 85-95% for target species
The Banff National Park wildlife crossings in Canada are among the most studied, showing dramatic reductions in mortality and increased genetic exchange
Hedgehog highways — small holes in garden fences — allow hedgehogs to range freely and have been linked to population stabilisation in urban areas
Green bridges and urban wildlife corridors connecting parks and green spaces are increasingly incorporated into city planning

Welfare Considerations

Road mortality causes immediate, violent deaths and prolonged suffering in injured animals that survive initial strikes. Beyond roads, isolated populations face chronic stress from reduced territory, limited mate choice, and nutritional deficiency in degraded habitats. The welfare cost of habitat fragmentation is diffuse and invisible compared to the acute suffering of a road-struck deer, but affects millions of individuals continuously. Wildlife corridors address both acute mortality and chronic stress by enabling animals to move, reproduce, and access resources freely — making them among the most impactful wildlife welfare interventions available.

What You Can Do

Create or join a hedgehog highway in your garden or neighbourhood to improve connectivity for small wildlife
Support campaigns for wildlife crossing structures on major roads through wild animal habitat
Advocate for wildlife corridor requirements in planning applications for new roads and developments
Reduce driving speed in wildlife-rich areas, particularly at dawn and dusk when animal movement peaks
Support national parks and conservation bodies working on landscape-scale connectivity projects
Plant wildlife-friendly gardens with native species to contribute to urban green corridors
Donate to organisations mapping and protecting wildlife corridors in your region