Cavemen

The Monkey people are a family of monkeys on the level "Sierra 117". To see the family of monkey people on Sierra 117, you must go past the point where Johnson's Pelican gets shot down. You will see a concrete column with the number 3 on it. When you stay beside the left wall and go as high as you can, you must turn around and you will see the monkey people against the wall. The largest of the monkey people is holding a teddy bear.

They are also referred to as "Cave Men" on many "youtube" videos.