Here's how I see this developing.
The Gorilla and the Polar Bear sight each other from afar, and come together in an hours-long staredown.
Things are getting pretty tense. They're both growling. The Polar Bear is flexing its razor-sharp claws, while the Gorilla tenses his muscular body. The Polar Bear makes the first move, and tries lunging at the Gorilla.
What happens next?
Game. Over.