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This is Scientific American 60-Second Science. I'm Karen Hopkin. This'll just take a minute.

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Based on the sheer number of ants that have invaded my home this summer, it seems hard to believe.

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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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the same period of time in which the human population has doubled.

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The estimate appears in the journal Science.

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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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Over the past 500 years, more than 300 species of vertebrates like these have disappeared.

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But what about critters that fly¡ or crawl¡ under our radar?

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Butterflies, beetles, spiders, slugs and worms are all in the midst of decline.

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Much of that die-off is due to habitat loss.

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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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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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So crowding out our invertebrate allies could turn out to be a real buzzkill.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Karen Hopkin.

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