You may have seen free-roaming cats in your area and wondered who they belong to. Although some people refer to them as "feral" cats, they are increasing being referred to as "community" cats because not all of them are actually feral and some of them are just pets who are lost. (For purposes of this page, the phrases "free-roaming" and "community" are used interchangeably.)
A "feral" cat is a cat who has reverted in some degree to a wild state or who was born outside and has never been socialized to people. They originate from former domestic cats who were lost or abandoned and then learned to live outdoors or in environments involving little human contact, such as warehouses, factories or abandoned buildings. In most cases, feral cats are not completely wild because they still depend on people for their food source, whether it's a caretaker who comes by once or twice a day, a dumpster outside a restaurant or garbage cans. Relatively few feral cats subsist only by hunting.
Free-roaming cats often live in groups called colonies. The size of a colony depends on the number of resources available. A colony can range in size from a few cats to dozens of cats. In many cases, the colony is a mix of cats who are not socialized to people and former pets who are lost and have joined the colony in order to share the resources of shelter, water and food.
Some people think that community cats should just be destroyed in order to remove the problem or to prevent them from destroying birds. Free-roaming cats live in certain areas because of the resources available there. If you destroy the cats, more will simply take their place. This is called “the vacuum effect.” The arguments that feral cats destroy wildlife or spread rabies are myths. Habitat destruction and pesticides are the main cause of diminishing wildlife. According to Alley Cat Allies, "the last confirmed cat to human transmission of rabies occurred more than 30 years ago. While it's possible for free-roaming cats to become infected with rabies, feral cat colonies themselves do not generally serve as a source of the disease. 'We see rabies more often in raccoons and bats than in the cat population,' says Roberta Lillich, DVM, president of the American Association of Feline Practitioners."
Studies have shown that Trap-Neuter-Return, commonly referred to as "TNR," is the only method proven to be humane and effective at controlling community cat population growth. Using this technique, all the cats in a colony are trapped, neutered (or spayed), vaccinated and then returned to their territory where caretakers provide them with regular food and shelter. Young kittens and friendly adults are placed in foster care and eventually adopted out to good homes. TNR stabilizes the size of the colony by eliminating new litters. The nuisance behavior often associated with feral cats is dramatically reduced, including the yowling and fighting that come with mating activity and the odor of unneutered males spraying to mark their territory.
Another significant advantage to TNR is that it lessens the number of kittens and cats flowing into local shelters. Community cats who are trapped and taken to shelters are ordinarily summarily destroyed. It has been said that a community cat does not belong in a shelter any more than does a squirrel. It is more humane and cost-effective to use TNR to control cat populations so that tax-dollars are not needlessly spent on what is sometimes referred to as a "catch and kill" method of handling free-roaming cats.