Study leader Karen McComb from the University of Sussex in the U.K. notes that not all cats make this purr-whine noise. Cats are more likely to purr-whine if they're the only cat in the household--possibly because the sound is more likely to be overlooked when there are multiple cats vying for attention. A louder meow could be more effective in multi-cat houses.
Get the story on the cat's purr on National Geographic News.
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that was kind of weird