Minor point here "feral" as in "feral pigs" means "of domesticated ancestry, but reverted to a mostly wild state".
This does not apply to hippos since they have never been domesticated at all, and those commenters suggesting that "just domesticate the hippos" would be a feasible task are IMHO very much underestimating something that they know nothing about.
This does not apply to hippos since they have never been domesticated at all, and those commenters suggesting that "just domesticate the hippos" would be a feasible task are IMHO very much underestimating something that they know nothing about.