Put the bird with its' beak on the pyramid, on your finger or on the tip of the pencil and you'll see that it holds the balance and does not fall. It's because the center of gravity (the center of mass) is located on the tip of its' beak. The center of mass is the point at which the body weight is perfectly balanced. You can twist a bird on a pyramid or on your finger and count how many turns the bird will make. And what about your nose? Will it hold there?
Experiment! It's fun!