Trap-neuter-return (TNR), also known astrap-test-vaccinate-alter-release (TTVAR), is a method of humanely trapping unaltered feral cats, spaying or neutering them, and returning them to the location where they were collected. TNR is promoted by the ASPCA as a humane and more effective alternative to euthanasia for managing and reducing feral cat populations as per APSCA NYCFCI feral cat sterilization guidelines.