Ever wanted to ‘keep an eye’ on someone hanging around in your vicinity? Sometimes that can be more difficult than it sounds.  Penguins have little to no binocular vision, so the alternate stare acts as a method of focusing on threatening objects.  These stares are given by penguins protecting their territory.  You will see the birds moving their heads slightly from side to side in an effort to let unwanted visitors know they are being watched.  In the event of a confrontation, the head is placed in such a position that it affords ample time to strike with the bill.- Vikki McClosky