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This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?

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Beneath its adorable exterior, is your cat hiding the heart of a killer?

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Researchers now estimate that each year, domestic cats kill billions of birds and mammals in the United States alone.

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The report is in Nature Communications.

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We already knew that domestic cats can wreak havoc on islands, causing 14 percent of species extinctions and ranking as one of the world's 100 worst invasive species.

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But now, scientists have reviewed previous studies to find just how much damage cats do on the mainland.

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Cats kill some 1.4 to 3.7 billion birds and 6.9 to 20.7 billion small mammals in the U.S.each year.

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These numbers mean that felines may be the biggest human-related cause of death for American birds and mammals.

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And cats tend to prey on native species, which can cause major ecosystem damage.

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The worst feline killers are those without owners, and reducing feral cat populations is an ongoing problem.

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But you can still reduce the impact of domestic cats by keeping your pet indoors,

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thus leaving the neighborhood a little less red in tooth and claw.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.

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