I recommend reading this informational page about the TNR program! It's very informative and important for cat colonies nation wide. It will explain why you see a cat (or several cats) with the tip of their ear clipped off.
Trap-Neuter-Return (TNR), the humane approach to addressing community cat populations, works. It saves cats’ lives and is effective. TNR improves the lives of cats, addresses community concerns, reduces complaints about cats, and stops the breeding cycle (annoying behaviors cease). Once TNR is carried out, cats and people co-exist.....
Published at: Alley Cat Allies.org