The egg is on the level Sierra 117 after the part where you see Sgt. Johnson's pelican go down and you enter the woods. First kill all of the jackal snipers all the way to the end. Turn around and comeback. When you see the part where it is elevated on the right side jump up on it and turn around. Now get on the wall on your left and walk on it until it ends. Turn around and there will be a family of monkeys big and small. The biggest monkey will be holding a teddy bear. They all have human faces on them. It's kind of weird but cool at the same time. Enjoy!