Hippopotamus are herbivores, eating primarily grass (about 250 lbs a day).
Hippopotamuses only known predators are humans, who poach them for their meat and ivory teeth. Although lions, crocodiles and hyenas may prey on the young.
No but the predator will be having a very bad day. Its the basic food chain. If a lion gets killed by a Hyena it dose not make the hyena the preditor since that was a lucky kill, where in normal...
Some animals are both predators and prey for other nastier predators, A good example is the Grizzly Bear. It is now a top predator, but was once prey for the Short Faced Bear, an animal that died out...
Koalas are just prey.Koalas are herbivorous, feeding primarily on eucalyptus leaves and blossoms, so they are not predators. They may fall prey to dingoes, domesticated dogs and foxes.