Limited Flight. The zombie chicken falls at the end of a turn if it’s airborne and the only thing holding it aloft is its flying speed.

Soft Landing. The zombie chicken doesn't take damage from falling 20 feet or less if it isn't incapacitated.

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

Peck. Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit: 1 piercing damage

Scratch. Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit: 1 slashing damage.

Fowl Cunning. The zombie chicken can move up to half its speed as a reaction when an enemy ends its turn within 5 feet of the zombie chicken. This movement doesn’t provoke opportunity attacks.