Ambusher. The wendigo has advantage on attack rolls against any creature it has surprised.

Mimicry. The wendigo can mimic any sounds it has heard, including voices. A creature that hears the sounds can tell they are imitations with a successful DC 14 Wisdom (Insight) check.

Pounce. If the wendigo 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 13 Strength saving throw or be knocked prone. If the target is prone, the wendigo can make one bite attack against it as a bonus action.

Masks of the Wild. The wendigo can attempt to hide even when it is only lightly obscured by foliage, heavy rain, falling snow, mist, or other natural phenomena.

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

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 3) piercing damage. On a hit, the target must succeed on a DC 13 Constitution saving throw or take an additional 7 (2d6) necrotic damage.

Claws. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 3) slashing damage.