Six versions of most zombies. Normal, Feral, Radiated and Tainted appear as your gamestage climbs; Rebirth adds the elemental Charged and Infernal. (*Charged and Infernal only come from scripted rooms in ; they're not in Rebirth's regular wilderness, POI or horde spawns.) Speed is shown as patrol / chase. "Loot bag" is the drop chance on a normal kill; in Rebirth, zombies under 100% only drop a bag on horde night or in a wandering herd (see the loot room).
Type
Version
Sort
Your gamestage
Your level
Biome
Difficulty bonus
Gamestage
Where
Gamestage = level × 2 × difficulty bonus × (1 + biome modifier) + biome bonus (Rebirth's formula; the difficulty bonus couldn't be read from the files, so type your real gamestage for exact results). Each spawn picks at random from Rebirth's lists for your gamestage bracket.