Research overview: trap-neuter-return and the management of free-ranging cats

Trap-neuter-return, in which free-ranging cats are sterilised and returned to colonies, is among the most contentious topics at the intersection of animal welfare and conservation. This overview synthesises research evaluating whether such programs reduce cat populations and predation, the demographic modelling showing the high sterilisation rates required, and critiques that colonies persist and continue killing wildlife and transmitting disease. It examines the polarised evidence and values underlying the debate, alternative management approaches, and the difficulty of reconciling welfare and biodiversity goals. The synthesis frames free-ranging cat management as a deeply contested arena where ecological data and ethical positions collide.