In nature, the best predictor of who prevails in a fight is the combined weight of preditor(s) versus prey. When lions and hyenas face off, the combined weight of each pack tends to pick the winner. With a few exceptions (such as American cougars vs elk) this also applies to preditors & prey. A mature bull can typically weigh between 500-1,000 kg. An adult male North American grizzly, the largest bear (after polar bears or Kodiak island ) likely to encounter a bull weighs on average 270 kg. So the bull will in most cases drive off the bear.
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