Cats may purr because they are happy or they want something, like food, from you. Mother cats and kittens communicate through purring, so the sound may be a carryover from kittenhood. The low ...

Is it a coffee machine gurgling its last drops? Is it a muffled phone vibrating on a couch? Is it a small helicopter trying to take off very politely? No, it’s Sylvester the cat, purring away after ...