The feral cat population in the UK
Estimates of the UK feral cat population range from 1.5 to 4 million — precise figures are difficult to establish by nature. Feral cats live in colonies typically centred on a food source: farms, industrial sites, urban alleys, and community spaces. Without management, colony size can double in a year through breeding and immigration of new cats.
The welfare consequences of unmanaged colonies are significant: kittens born to feral mothers face high neonatal mortality, disease, and starvation in their first weeks. Adults face infections, injuries from fighting, and the health consequences of continuous reproduction in females. The RSPCA feral cat guidance sets out the welfare case for active management.
What is trap-neuter-return (TNR)?
TNR is a three-stage management approach:
Trap
Cats are humanely trapped using box traps baited with food. A trained handler monitors the trap to minimise distress and process cats promptly.
Neuter
Cats are neutered under general anaesthesia. Ear-tipping — removal of 1 cm from the tip of the left ear — is performed at the same time as a permanent, visible identifier that the cat is neutered. Vaccinations and health checks are also carried out.
Return
Cats are returned to their original colony site where a colony caretaker provides food and monitors health. Socialised cats and young kittens may be fostered or rehomed rather than returned.
Does TNR work?
Evidence from long-term studies in the US, UK, and continental Europe consistently shows that TNR reduces colony size over time where at least 70–80% of the colony is reached, and stabilises population immediately by stopping new births. Studies reviewed by the Alley Cat Allies evidence base also document significant health improvements in managed colonies compared to unmanaged populations.
The key limitation of TNR is maintaining coverage — if new unsterilised cats enter the territory, population rebounds. This is why ongoing colony management (monitoring, trapping newcomers) is essential, not a one-time intervention.
How to support National Feral Cat Day
- Share TNR information and colony caretaker resources on social media
- Donate to Cats Protection's neutering fund, which subsidises TNR work
- If you are a colony caretaker, connect with your local Cats Protection branch for resources and support
- If you find young feral kittens, contact a local rescue about socialisation fostering — see our socialising a kitten guide for what is involved