Dogs
When playing zombies on some maps there is dog round where many zombie dogs try to attack you and once you've killed them all you will recieve a max ammo
Witches
On the map Buried once you enter the scarey house these witches will attack you after killing them all though you will recieve a free random perk
Jumpers
When on the map Die Rise these zombies will attack you on a random round then attack you they can climb on walls
Brutus
On the map Mob of the Dead this zombies boss called brutus as well as warden will follow you around the map destroying mystery boxes and perk machine making the experience harder for the players
Panzer
This zombies boss appears on the map Origins and chances you around the map. Unlike other bosses this boss can domultiple things. It has a flamethrower, claw and can fly making it really difficult to kill him