Happy or hungry? Cats can use their purrs to send either message, an acoustical study suggests

Flores, Elizabeth, Star Tribune

"Brown Derby," a Persian cat, purred as he rested near owner Carl Sletten of Stillwater, at the Seventh Annual Austin Purrs, International Cat of Mystery in May.

By MALCOLM RITTER , Associated Press

Last update: July 13, 2009 - 1:27 PM

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NEW YORK - A cat's purr normally says, "I'm happy." But a new study suggests some purrs send cat owners a much different message: "Feed me!"

Researchers found that purrs of hungry cats included a higher-pitched sound, somewhat like a cry or meow. They played recordings of these purrs from 10 cats to 50 human volunteers. Even people who'd never owned a cat found them to be more urgent and less pleasant than contented purrs from the same animals.

These food-seeking purrs may exploit the way humans naturally respond to a baby's cry, the researchers suggest. Not all cats use this strategy, but some apparently learn to turn it on when they see it's effective in getting a human to feed them, Karen McComb of the University of Sussex in England said in a statement.

She and co-authors present their work in Tuesday's issue of the journal Current Biology.

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Current Biology: http://www.cell.com/current-biology/

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