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20 years ago. "About that time, the wild dogs caught and killed another impala right next to the edge of the water hole, and three hippos came out of the water and tried to take away the carcass of the impala, the antelope, from the wild dogs. As far as I had ever heard, hippos didn't do either of these things." We now know that carnivory is actually common among hippos. And meat-eating could explain what's been a hippo public health mystery: anthrax outbreaks happen naturally among African herbivores, but the pattern of anthrax transmission in hippos has always puzzled researchers. Could their hankering for meat explain it? Dudley's latest research suggests that the hippos' could owe their unique susceptibility to anthrax die-offs to their practice of eating meat that carries the infection―including the bodies of other dead hippos. The study is in the journal Mammal Review. And that means that humans who come into contact with hippo meat need to take care. At least

511 Zambians became infected, and five died, because they handled or consumed hippo meat during a

2011 anthrax outbreak among the amphibious mammals. That's one advantage of being a vegetarian―for both hippos and humans.