My cat doesn't have a collar on him. He doesn't have tags on him. He is my pet. You would kill him if you saw him kill a bird, which he does from time to time because he is a cat, am I understanding this correctly? None of our cats have ever worn collars and or tags. Yet, if you saw them you would automatically assume that they were strays and you would kill them. Yes, this is really helping the problem Mr. Wildlife Biologist.