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No, guinea pigs SHOULD NOT be put in exercise balls, just as the first person said. Any guinea-pig-competent vet will tell you that.

And concerning the article, ferrets are not rodents. They're mustelids, like weasels, skunks, and otters. Anyone reading this page would do very well to do thorough research elsewhere concerning any type of pet they are considering adopting, since there seem to be some blatant errors here.