Trap-Neuter-Return or "TNR" is the most humane and effective way of dealing with feral cat colonies. Killing cats has never solved the problem of feral overpopulation. A large scale spay/neuter and return operation has been proven to effectively lower feral cat population
and reduce the numbers of stray cats being brought to the kill shelters.
A model program is working in Jacksonville, Florida. Please watch the video, "Feral Freedom"
Please note, the video states, cats are micro chipped. That function has been discontinued in the Jacksonville TNR operations
"An adoption or transfer to a rescue group frees up scarce cage and kennel space, reduces expenses for feeding, cleaning, and killing, and improves a community’s rate of lifesaving. Because millions of dogs and cats are killed in shelters annually, rare is the circumstance in which a rescue group should be denied an animal."
"Adoptions are vital to an agency’s lifesaving mission. The quantity and quality of shelter adoptions is in shelter management’s hands, making lifesaving a direct function of shelter policies and practice. If shelters better promoted their animals and had adoption programs responsive to community needs, including public access hours for working people, offsite adoptions, adoption incentives, and effective marketing, they could increase the number of homes available and replace killing with adoptions. Contrary to conventional wisdom, shelters can adopt their way out of killing."
No Kill Advocacy Center
A No Kill Nation Is Within Our Reach
"If every animal shelter in the United States embraced the No Kill philosophy and the programs and services that make it possible, we would save nearly four million dogs and cats who are
scheduled to die in shelters this year, and the year after that. It is not an impossible dream."