Trap-Neuter-Return, commonly referred to as TNR, is a humane method of managing and reducing feral cat populations. In this process, feral cats are humanely trapped, transported to a veterinarian for evaluation, vaccination, ear tipping, and sterilization (spay/neuter) , then returned to their colony. Ear tipping, the practice of cropping the pointed end of the ear, is used to identify feral cats who have been sterilized.
Read more about the Feral Cat Initiative underway in New York City.