The grizzly's massive size and strength advantage is too much for the lion to overcome.
This matchup is deceptive because people tend to romanticize the lion as 'king of the jungle.' But the grizzly bear outweighs the lion by 300-400+ pounds and has superior raw strength, reach, and durability.
A grizzly's paw swipe delivers an estimated 1,160 pounds of force โ enough to break a lion's spine in a single blow. Its claws are 4 inches long and can tear through muscle and bone. The grizzly also has a significant height advantage when standing upright, giving it leverage in a grappling scenario.
The lion's advantages are speed and combat experience โ lions fight other large predators regularly (hyenas, rival lions, leopards). A lion could theoretically use its speed to get behind the bear and target the neck. But the bear's thick fur and fat layer provide natural armor that the lion's claws and teeth would struggle to penetrate deeply.
In documented encounters between bears and big cats (albeit different species), the bear almost always wins when size-matched or larger. A 900-pound grizzly versus a 550-pound lion is simply too large a size gap.
The grizzly is 60-80% heavier with proportionally greater strength. Its claws are longer, its bite force is comparable, and its thick layer of fat and fur provides natural armor. A single full-force paw swipe could cripple the lion. The grizzly can also fight effectively on its hind legs, using its height advantage to rain blows down.
The lion is significantly faster and has vastly more combat experience against large opponents. Its reflexes are quicker, and as a social predator, it's fought for survival its entire life. If the lion can avoid the grizzly's power shots and target the throat, it could theoretically land a killing bite before the bear can respond.
The grizzly wins convincingly through sheer size and power. The lion is an incredible fighter, but the weight difference is comparable to a welterweight fighting a super heavyweight โ the smaller fighter can be more skilled and still lose because the physics don't work in their favor.
Grizzly Bear also fights
African Lion also fights