Secret to Penguin Locomotion Revealed

Penguins are wobbly on land, but their extreme underwater agility involves the perfection of a twisting wing motion that is just now coming to be understood.  A new study found that by twisting their wings while pumping them under water to swim, the birds are able to vary the thrust of their flapping and increase control over their movements.  The motion is so useful researchers are testing it out on prototypes for new underwater spy vehicles.

http://www.livescience.com/animals/081113-penguins-twist.html