So when the penguin takes a step, its center of mass is low, so when he stops coming up over his leg, the mass moves to the side, ... And it's high now, and as it starts rocking backward, it starts falling to the side, it's also falling forward.  -   Tim Griffin     Quotes
So when the penguin takes a step, its center of mass is low, so when he stops coming up over his leg, the mass moves to the side, ... And it's high now, and as it starts rocking backward, it starts falling to the side, it's also falling forward. Tim Griffin