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The closest relative of the measles virus is one that causes rinderpest, a disease that affected cattle, deer, buffalo, and other even-toed ungulate species before it was eradicated in 2011.

This time the pair named their new record after an even-toed ungulate: “Hippopotamus.”

This is all very cosy, even if we are turned into zoo creatures being looked at by an even-toed ungulate.