Feral

All zombies have a chance to spawn with a special trait - Feral, Radiated, or both. A Feral zombie will acquire glowing orange eyes, increased health, entity and block damage, and will always run when chasing a player, ignoring the game settings for that world and the day/ night cycle, along with faster animations in general (waking up, attacking, recovering from a fall, etc..).

Feral zombies will appear more frequently as the player's Gamestage progresses, showing up more often in certain Point of Interests and Blood Moon Hordes.