i often look at my cat and imagine her to be this huge wild panther that i single-handedly domesticated, i toned down her killer instincts with kindness and patience and led her to a life of warm bed covers and snuggles. and shrunk her too, i guess. or maybe i shrunk. then i imagine cuddling up under her chin, between her huge black paws and the loud roaring non-stop purr she would emit. but i'm wrong. panthers don't purr. in fact, neither do lions, really. way to ruin my fantasy wikipedia:
All cats are able to purr. However, the entire Panthera genus is able to purr only while exhaling. Cats that roar lack the purring vocal cords, and use the vocal cords in charge of roaring and growling instead, making a noise similar to growling when they purr. As a result, the two sounds are often confused. The roar in these cats is a very loud growl with respect to the production method. Additionally, because these cords can only be used while exhaling, the purring equivalent sound can only be made while exhaling. Cats that are not members of the Panthera genus, even larger ones such as the cheetah, purr.
ok, so i'm going to get a cheetah instead.