Good point. I couldn't find any statistics on human deaths or injuries by animal type in a minute's search, and I don't have time to spare right now. But I agree that my hypothesis needs to be fact checked. (Just two animal examples, hippos and buffalos, in a single continent in a couple of decades don't make a theory. And all four of your links don't refer to any actual data, they just state that hippos are the most dangerous.)