Will lions and elephants roam North America?

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Academics at Cornell University say they've come up with a way to restore the ecological balance of North American grasslands: let some cheetahs loose.

Josh Donlon, a graduate student in the Department of Ecology and Evolutionary Biology, is the lead author on a paper proposing a program under which wild African animals such as lions, elephants and cheetahs could be introduced onto large swaths of private land in the middle of the country.