Finally: a thread about something meaningful.
Hippoi are herbiverous, which suggest to me that they may not have much instinct to fight. They also don’t have teeth designed for tearing and stabbing, nor do they have claws for catching. They also don’t look nearly as agile; I’m betting a polar bear could come at a hippo from all sides in the time it took a hippo just to turn around.
I recall that back in the 70s (and for, all I know, a good deal of time before and after), there was a “zany” car dealer in Southern California who used to pose with exotic animals in his TV commercials–doubtless there are Dopers who could name him in an instant. In any case, I recall he had an ad in which he rode a hippo. It looked relatively fast, but I have the impression that it would compare as a tortoise to a hare in a dead heat with a polar bear. It also comes to mind that while there is apparently at least one hippo docile enough to be ridden for a while, I doubt anyone could manage to mount a polar bear.
Hippoi are, obviously, powerfully built animals, but they are mostly built to float in the water and chew grass. Polar bear are tremendously powerful carnivores who dine on walrusses which are, I guess, about the closest equivalent the Arctic has to a hippo.
There is also the point that a polar bear is fur-covered, while a hippo is said to actually have quite sensitive skin, which helps account for why it spends so much of the time wallowing in mud.
Venue might be a factor too. Polar bears seem to do fine outdoors in a St. Louis summer, but I wonder if a hippo could hack it on a polar bear’s home turf.
I’m betting the polar bear would win handily wherever a match was held unless the hippo had a gun or something. Then again, I remember having an argument like this when I was a kid about a steer going up against a lion. My money was on the lion. Later I read that such matches were considered a sucker bet in the days of the Roman Collisseum; supposedly, every time a match was ever held, a longhorned steer beat a lion hands-down.
No kidding: you think you could see this on Pay per View? Maybe somebody could figure out a way to settle these arguments through a computer simulation or something.