Apparently scientists have increasingly documented hippos eating meat. This behavior went unnoticed because hippos are largely active at night and good night vision cameras weren't common until recently.
Many people believe that elephants see us the same way we see puppies. In other words, many think elephants see us as cute and harmless creatures roaming on Earth.
I think that means they're the ones causing the most accidents to humans, not necessarily that they would win in a fight against other species in a DBZ style tournament.