The consensus among experts and animal enthusiasts is that a grizzly bear would most likely win in a fight against a silverback gorilla. Key reasons include:

• Size and weight advantage: Grizzly bears typically weigh around 600 to 800 pounds or more, which is roughly twice the weight of a silverback gorilla, which averages around 300 to 400 pounds. This size difference gives the bear a significant advantage in power and durability

• Physical weapons: Grizzlies have large, dagger-like claws and powerful jaws with a strong bite force capable of inflicting lethal damage quickly. Their thick skin and muscle mass make it difficult for a gorilla to cause fatal wounds

• Aggression and combat experience: Grizzly bears are natural predators with experience hunting and fighting other animals, while gorillas are mostly herbivores and less aggressive fighters. Bears have instincts and fighting skills honed for lethal combat

• Strength and agility: While gorillas possess remarkable muscle strength—estimated at 4 to 9 times that of a human and capable of lifting close to ten times their body weight—they lack the bear's reach, claws, and bite power. Gorillas are more agile and can deliver powerful blows, but these advantages are generally outweighed by the bear's size and weaponry

• Fight dynamics: If the bear lands a hit first, it is likely game over for the gorilla. The gorilla would need to avoid the bear’s claws and bite and deliver a fatal blow quickly, which is a difficult scenario given the bear's size and offensive capabilities

In summary, while a gorilla is incredibly strong and agile, the grizzly bear's size, claws, bite force, and predatory experience make it the overwhelming favorite in a hypothetical fight between the two