Monkeys

Monkeys are due to appear in Call of Duty: Black Ops, as listed on the leaked acheivements list. There is an acheivement called "I hate monkeys", where you have to kill 7 monkeys in under 10 seconds in the Rebirth labs. This is similiar to the "Colonel Sanderson" acheivement in Modern Warfare 2, where you have to kill the same amount of chickens in under 10 seconds also.