Why do cats purr? I've always wanted to know why cats purr. I've heard it's because they're in a good mood or very nervous. But why is that?

Ppl say they put when they r happy but studies show its them claiming a humain

Cats do indeed purr when they're contented, however they also do purr if wounded or anxious, as purring stimulates a response that mends their bones.

If you wondering how they make that sound, then no one really knows.

It is because they are happy, for attention. They don't car if it's you, the cat molester down the street, or the man who kills people for money.

they usally purr if they are in great pain or if they are very comfortable or happy and they purr by rubbbing their vocol cords together

Because that is the sound happy cats make.