They don't live in the same continent. The salt water croc lives in Australasia, swims out into the ocean and kills sharks.
It's the only creature that has its own killing movement known as the Death Roll.
Team croc reporting. How can you compare a salt water croc who swims into an open ocean to kill sharks, which a grass eating lump of lard.
The only danger a hippo causes is clumsiness knocking boats over that get in its way.
The croc is a survivor of the dinosaur age.