Definition: Cats that are being cared for by colony caretaker brought to shelter or offsite spay/neuter clinic, spay/neutered and vaccinated and returned to the colony. TNR cats are often not taken into custody of organizations because they generally have established caretakers or colonies.
Definition: Stray animal is not taken into the shelter at all, but owner is located and animal is returned to owner while the animal control officer is in the field through the scanning of a microchip, etc.