The new Zombie map, Shangri-La from Annihilation DLC, features immortal zombie monkeys. At first they don't appear to do anything, though they respawn when they are killed. However, once a power-up drops nearby, these zombie monkeys will snatch up the power-up and attempt to take it back to the shrine. While running back to the shrine, the power-up in the monkey's possession will switch between the different power-ups. If you kill it, it will drop whatever power-up it held last, but other zombie monkeys will attempt to retrieve it as well. If you manage to grab it before a monkey does, the monkey tries to loot 50 points from you.