University of Central Florida Study: This study was a test of how effective the TNR program was at stabilizing community cat population.
- TNR program was tracked over the course of 11 years
- Population declined by 66%
- No new kittens born after 4 years of operation
- At the end of the study, most remaining cats were adults
- 83% had been part of the program for more than 6 years
Conclusion: TNR keeps cat colonies healthy and stable both short and long term

Sources:
- https://www.huffingtonpost.com/susan-houser/counting-feral-cats_b_9341786.html
- https://www.nj.gov/health/vph/animal-control/feral-cats/
- https://www.alleycat.org/resources/why-trap-neuter-return-feral-cats-the-case-for-tnr/
- https://www.alleycat.org/resources/why-trap-neuter-return-feral-cats-the-case-for-tnr/#improves
- https://www.neighborhoodcats.org/how-to-tnr/getting-started/the-7-steps-of-tnr
- https://www.alleycat.org/resources/tnr-is-effective-on-college-campuses/
- https://irp-cdn.multiscreensite.com/ff554b06/files/uploaded/case%20studies%20in%20TNR.pdf