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1 .This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?
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2 .Beneath its adorable exterior, is your cat hiding the heart of a killer?
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3 .Researchers now estimate that each year, domestic cats kill billions of birds and mammals in the United States alone.
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4 .The report is in Nature Communications.
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5 .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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6 .But now, scientists have reviewed previous studies to find just how much damage cats do on the mainland.
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7 .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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8 .These numbers mean that felines may be the biggest human-related cause of death for American birds and mammals.
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9 .And cats tend to prey on native species, which can cause major ecosystem damage.
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10 .The worst feline killers are those without owners, and reducing feral cat populations is an ongoing problem.
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11 .But you can still reduce the impact of domestic cats by keeping your pet indoors,
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12 .thus leaving the neighborhood a little less red in tooth and claw.
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13 .Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.
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