I have always thought that the Auk was a flightless bird.

You call those wings?
However, that is only true for the Great Auk which is now extinct (and pictured above). The Auks that are around today certainly enjoy their evolved wings…

Go Little Auk Go!
BONUS FACT: The Great Auk is was the only species in the genus Pinguinus, a group which included several flightless giant auks from the Atlantic, to survive until modern times!