This is actually somewhat mind blowing; https://en.wikipedia.org/wiki/List_of_birds_by_flight_heights
Whooper swan Cygnus cygnus Anatidae 8,200 metres (27,000 feet) This height was attained by a flock of whooper swans flying over Northern Ireland, and recorded by radar.
That's rad. I spotted a bearded vulture a few weeks ago in Switzerland. We were at 3000m, didn't realise they can go up to 7300m!
@Stonehedge started
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This is actually somewhat mind blowing; https://en.wikipedia.org/wiki/List_of_birds_by_flight_heights