Domestic and feral cats kill billions of birds and small mammals annually, creating a significant wildlife welfare impact that responsible ownership can partially address.
Birds and small mammals caught by cats experience fear, injury, and death. Many animals survive initial capture with serious wounds that lead to slow death from infection. Ground-nesting birds and their chicks are particularly vulnerable. Wildlife welfare concerns must be balanced against cat welfare needs; outdoor access provides cats with exercise and natural behaviour but imposes significant costs on wildlife. Evidence-based mitigation rather than complete indoor confinement is the pragmatic approach for most cats.