There are varying forms of aggression, but first I would like to point out the difference between displays of aggression and actual aggression. This individual may or may not act upon receiving those signals. For a number of years, this behaviour was hard to assess. However, this behaviour does not seem to be directed towards particular individuals, rather groups, neighbors or passer-bys.
Penguins have poor binocular vision, and some penguins have no binocular vision at all.
These stares may be performed while lying down or while standing. In either case, the head of the staring penguin is placed in such a position that affords it ample time to strike with its bill. The alternate stare serves the same purpose of the sideways stare but is separated from the former because it is employed during more intense situations. The focal penguin may perform an alternate stare if an intruder persists in the territory or if neighbors tend to move about frequently near the nest. The point and gape are closely related and often the gape is the logical progression from the point behaviour.