The original post is nonsense. Penguins are incredibly inefficient at waddling around on land, but they are extremely efficient in the water. Much of their preferred locomotion on land is sliding on their belly in the snow which is more energy efficient than waddling. So the idea that their third most energy effecient form of locomotion is more effect than a human on land is pretty absurd.
Also, that's a Gentoo.
They are pretty cute...when they aren't actively slapping or biting you.
Much of their communication is vocal forms of communication with visual displays and violence mixed in. They will great their mates and chicks with vocalizing. For some species, they will display with their eyes and posture. If they need more communication with will bite and slap.