Ear-Tipped Or Notched
This is a surgical alteration showing that a free-living cat has been spayed/neutered. It is part of “TNR” which stands for “Trap, Neuter, Return”.
Cats that have been ear-tipped should never be re-trapped or brought to a shelter, unless sick. Instead, they should be left in their neighborhood to provide cat population control. Studies have shown by just being there, they prevent other cats from moving into the area. And, because they have been fixed, they will never have litters of kittens.
Even if you don’t like cats, TNR ear-tipped cats have an important job to do in keeping your neighborhood a nice place to live.