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1 .This is Scientific American 60-Second Science. I'm Cynthia Graber. Got a minute?
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2 .Humanity has a long history of working together to hunt large prey.
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3 .As evidence, see the extinction rates of large animals after people first arrive in a new locale.
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4 .Now scientists have a clearer view of our predatory role, across a number of terrestrial and marine ecosystems.
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5 .And the picture is not a pretty one, we have some bad hunting habits.
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6 .Researchers surveyed 2,125 species of predators on land and in the water.
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7 .And they compared the behavior of non-human predators to humans in those ecosystems.
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8 .Perhaps not surprisingly, humans prey on important large carnivores at a dramatically higher rate than other predators do.
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9 .The biggest difference, however, comes in which members of the population we cull.
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10 .Typical predators might kill the young or the infirm.
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11 .Humans, both on land and particularly in the water, claim a disproportionate number of mature healthy adults of reproductive age.
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12 .This practice has dramatic consequences.
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13 .Removing reproductive adults, especially for species that mature slowly, can do long-term damage to the entire population.
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14 .The authors thus call humans "super-predators."
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15 .Their report is in the journal Science.
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16 .They write that options to encourage more sustainable exploitation could include reducing the take,
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17 .but also mimicking other predators and leaving full-grown adults alone to continue repopulating their habitats.
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18 .Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.
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