One obvious master of the master class has not yet been
mentioned: the Frigate Bird.

I have seen them soaring over water on calm days, seen them
wings tucked forward and gliding well into a 35 knt wind. They are
on the wing all day, mate on the wing, not only are they the best
soaring birds by a LONG way, they have by far the best l/d. Just
look at their wing form - they are all about aspect ratio and going
places.

They not only out-soar all other forms of soaring birds, but steal
their food from them as well! (hence the name, also called Man o'
War birds).

Incidentally, having glid with pelligoons many times in the
Caribbean, I can vouch that pelicans and hang gliders have about
the same l/d and sink rate. However, they are much better at
diving into water, although I did try that once, but it is a hard way
to make a living.

anyway, Frigate birds rule!

bwBB