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die-off |
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Some scientists have theorized that a single, large asteroid may have hit the Yucatan Peninsula in present-day Mexico, sparking the die-off. The only" exception is the die-off of mammals between 50,000 and 45,000 years ago, the team reports in the January Geology. A distant relative of the common domestic ferret, the wild black-footed ferret of North America is endangered, in large part because of the mass die-off of its main food source--prairie dogs--at the hands of poisoning, shootings and diseases (see "Open Season on Varmints," cover story, July/August 2004). |
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