Wild Mountain Lion Welfare: Urban Edges and the Costs of Coexistence

Mountain lions increasingly navigate urban-wildland interfaces, facing vehicle strikes, poisoning from rodenticide prey, and lethal conflict that cause welfare harms and population pressure.

Key Facts

Mountain lion (puma/cougar) populations are stable in western North America but fragmented in many areas
They require large territories — males patrol 50-150 square miles — making urban-wildland interface conflicts inevitable
Secondary rodenticide poisoning — from eating rodents killed by anticoagulant poisons — causes internal bleeding and prolonged suffering
Vehicle collisions kill dozens to hundreds of mountain lions annually in California alone
The famous Puma P-22, who lived in Griffith Park Los Angeles for a decade, died from mange worsened by rodenticide exposure
Wildlife crossing infrastructure — freeway underpasses and overpasses — dramatically reduces vehicle mortality

Welfare Considerations

Mountain lions living at urban edges experience chronic stress from human proximity, vehicle traffic, and exposure to anticoagulant rodenticides through prey. Rodenticide secondary poisoning causes coagulopathy — inability of blood to clot — resulting in internal haemorrhage, weakness, and prolonged suffering before death. Vehicle strikes cause traumatic injuries from which many animals do not survive, or survive with injuries that impair hunting ability and lead to eventual starvation. Mange, worsened by immune suppression from rodenticide exposure, causes chronic skin suffering. The Wallis Annenberg Wildlife Crossing in California, completed in 2023, represents a landmark wildlife infrastructure investment directly reducing vehicle mortality for mountain lions and other wildlife.

What You Can Do

Use only snap traps or non-anticoagulant rodent control — refuse second-generation anticoagulant rodenticides
Support California Department of Fish and Wildlife mountain lion protection campaigns
Donate to wildlife crossing infrastructure advocacy in mountain lion range states
Support wilderness connectivity projects linking fragmented mountain lion habitat patches