Glen Barr I trapped & neutered/spayed 11 cats from a farm. They weren’t feral... just barn cats that you could pet but not pick up. The local SPCA did their surgeries & required the ear tip. I actually have one with a right ear tip. I guess someone wasn’t good at recognizing right vs left?!?! It comes in handy though, because the cats are identical black sisters & one right tip and one left tip helps me tell them apart!