Thanks for covering this and this is part of the education process.  Interesting that whenever I rationally explain TNRM most grasp the nuances of same...it creates a better dialogue...it's not just feeding felines.  By the way, the relatively new description of feral cats are Free Roaming Cats since they may be part of a colony and some who are pets that "roam".  Hence, even when trapped and taken in for neutering a scan is done to ascertain it a pet and returned to owner...again thanks for sharing the notch on the ear!