How about high flying birds?
I just looked this up and it appears the Bar-headed Goose wins, based upon "routine" altitudes.
Quote:
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The Bar-headed Goose is believed to be the highest flying bird having been seen at up to 10175 m (33,382 feet). It has a slightly larger wing area for its weight than other geese and it is believed this helps the goose to fly so high
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http://en.wikipedia.org/wiki/Bar-headed_Goose
I did find a report of a jet airplane hitting a vulture at ~37,000 feet. Not sure how they determined it was a vulture? Vulture parts on the plane?