Keen Smell. The tigorilla has advantage on Wisdom (Perception) checks that rely on smell. 

Menace. If the tigorilla is engaged in melee combat with only one creature, attacks made against it are made at a disadvantage.

Pounce. If the tigorilla moves at least 20 feet straight toward a creature and then hits it with a claw attack on the same turn, that target must succeed on a DC 16 Strength saving throw or be knocked [Tooltip Not Found]. If the target is [Tooltip Not Found], the tigorilla can make one bite attack against it as a bonus action.

Trample. If the tigorilla reduces a creatures HP to 0 the tigorilla may make an attack as a bonus action.

Multiattack. The tigorilla makes three attacks:one with its bite and two with its claws

Bite. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 18 (3d8 + 5) piercing damage.

Claw. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 14 (2d8 + 5) slashing damage.