There are as many theories about why cats purr as there are types of cats (we’re lookin’ at you, T. S. Eliot). It’s common knowledge that cats purr when they’re content, like when they’re being fed or stroked, but their unique, vibrating sound may also have a specific connection to their human masters. A University of Sussex study suggests that cats may have developed a ‘soliciting’ purr to obtain food and attention from humans, similar to the co-evolutionary benefits shared between humans and dogs. But there’s another reason that early humans may have made some feline friends: domestic cats purr at a frequency of 25 – 100 vibrations per second, an ideal range for reducing stress, lowering blood pressure, relieving pain, and promoting healing in both bones and soft tissues. So, essentially, a purring kitty in the vicinity may have served as a form of furry first aid. Elephants, by the way, also make a low-pitched, purr-like sound to communicate, though you probably wouldn’t want one to sit on your lap.
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