I have to vote for the Sandhill Cranes also. If for no other reason
that their flocks are so large, and they seem to thermal in the same
direction, that they can form the outline of the thermal. Very cool
to see and a pretty bird to boot.

Turkey vultures I have seen ridge soaring at Devil's Lake in
Wisconsin. But not a good looking bird.

Then again being land locked we don't see many frigate birds,
albatrosses, etc, etc,

- John DeRosa