Keen Smell. The bear has advantage on Wisdom (Perception) checks that rely on smell. Rear up. The bear may use half of its movement speed to stand upright until the end of its turn, or if it grapples a target, until the grapple ends. While standing the bears movement speed is 0 and the bear has advantage on Wisdom (Perception) checks. While standing the bear can also attack twice with its claws but cannot bite unless it has the target grappled.
Multiattack (Standing Only). The bear makes two claw attacks but cannot bite. Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: (2d6 + 4) piercing damage. Claws. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: (1d8 + 4) slashing damage. Grapple (Standing Only). The bear makes a Strength check to grapple one target using both it's claws. While grappling the bear cannot make claw attacks but can bite, rolling with advantage.