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1 .This is Scientific American 60-Second Science. I'm Karen Hopkin. This'll just take a minute.
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2 .Based on the sheer number of ants that have invaded my home this summer, it seems hard to believe.
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3 .But a new study finds that the number of invertebrates, which include any animal without a spine has fallen by nearly half over the past 35 years,
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4 .the same period of time in which the human population has doubled.
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5 .The estimate appears in the journal Science.
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6 .When we think of extinction, we usually picture large, charismatic creatures, like the saber-toothed tiger, the wooly mammoth or even the dodo bird.
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7 .Over the past 500 years, more than 300 species of vertebrates like these have disappeared.
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8 .But what about critters that fly¡ or crawl¡ under our radar?
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9 .Butterflies, beetles, spiders, slugs and worms are all in the midst of decline.
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10 .Much of that die-off is due to habitat loss.
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11 .In the U.K., for example, scientists have recorded a 30 to 60 percent decrease in areas inhabited by common insects, including bees and wasps.
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12 .While fewer flying pests might seem a plus, insects also perform functions that are key to human survival, like pollinating crops and recycling nutrients.
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13 .So crowding out our invertebrate allies could turn out to be a real buzzkill.
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14 .Thanks for the minute, for Scientific American 60-Second Science. I'm Karen Hopkin.
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