I know you have been taught that, Their digestive system and teeth evolved to make best use of the grass that makes up the bulk of their diet. That said, your premise is false.
Hippos absolutely do eat meat, when it presents itself on their doorstep.
They have considerable trouble actually biting off and chewing meat, so tend to go for stuff that’s softened up a bit, or that crocs have already torn up enough for them to get a share.
