Art, Science and Conservation - Paul Nicklen
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Flight of the Penguin

Two emperor penguins fly through the air as they clear the ice edge. The propulsion
these flightless birds achieve is thanks to the bubble physiology they have developed in their feathers over hundreds of thousands of years. It is an evolutionary adaptation used to avoid predators and it allows them to reach great speeds underwater as they exit the icy seas and land with a thud on the sea ice.