Long ago, penguins faced a trade-off between the air and the sea. The evolutionary process may not make sense with the 40-mile penguin march, but as with all adaptions in nature, the outcome reaped the greater benefits for survival.
There are many accounts of close connections established among con-specific or inter-specific animals indicating that love and friendship among non-humans are rather frequent emotions and go beyond anthropomorphic interpretations.
George Murray Levick, scientist with the 1910 Antarctic expedition led by Captain Scott, conducted a study on the "Sexual Habits of Adelie Penguins." His paper was considered too "graphic" for publication and remained unknown until recently.
Penguins at the zoo voluntarily leave their water exhibit and begin forming a line up at the big doors to head in for the night 10 minutes before the zoo closes for the night and before any trainer comes to call them.