The slender walk is where the penguin’s body is stretched vertically, the neck is elongated and the head is held high.  The African penguin adopts this posture when moving through the territory of other birds.  By moving in the slender walk manner, the penguin signals to other birds that it is not a threat and need not be pecked.  You can watch our penguins on our webcam exhibiting this behavior when walking on land and approaching a nest box. – Allan Jan