Mountain lions in urbanizing landscapes face habitat fragmentation, vehicle collisions, and conflict that impose welfare costs on individuals navigating increasingly developed environments.
Mountain lion welfare in urbanizing California and other western states reflects the broader challenge of large carnivore survival in human-dominated landscapes. Vehicle strikes kill mountain lions instantly or leave animals with severe injuries who survive for varying periods. Rodenticide accumulation causes neurological signs and immune compromise before death. Habitat fragmentation isolates populations in road-bounded landscape islands, reducing genetic diversity. Infrastructure investment in wildlife crossings — proven effective at reducing vehicle mortality — is both conservation and welfare intervention for a species whose territorial requirements make fragmented landscapes genuinely dangerous.