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

Undead Fortitude. If damage reduces the zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is fire, radiant, or from a critical hit. On a success, the zombie drops to 1 hit point instead.

Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) bludgeoning damage. On a hit, a creature must make a DC 13 Constitution saving throw or be poisoned for 1 minute.

Flesh Toss. Ranged Weapon Attack: +3 to hit, range 20/60 ft., one target. Hit: 3 (1d4+1) bludgeoning damage.