Now, I know why my cats purr, because they are happy and content. I guess it's like a contented sigh that we humans do. My new kitten's purring early this morning kept me awake. It sounded like a motorboat. In fact, I think she purrs louder than she meows. Her purr is bigger than her body, I think. What I want to know is what is happening inside her body to make that noise. Does anyone know or have any ideas?