Penguins have heavy bodies; they lack arms for climbing and wings for flying, yet they can leap out of the water like arrows from a bow when heading for shore. Why is this?
Underwater camera footage reveals the answer: a penguin paddles its flipper-like limbs toward the surface. After surfacing, it heads straight for the shore. As it nears the ice, it suddenly dips its head, plunges into the water, and dives deep with all its might. Reaching a depth of about 10 meters, the penguin suddenly flips, pointing its head upward and rapidly paddling its short feet to surge upward. It leaps out of the water, gives its clumsy tail a flick, tilts its body toward the shore, and lands steadily on the ice.
It turns out that its diving is meant to facilitate a better ascent. Without the process of sinking, there would be no surprise in rising. Without the accumulation during the dive, there would be no power for the burst.