How high do birds fly?

["G Glass" <>]

This observation won't be a record, I know, but it may add to the general
interest.

About 1978 when in a light plane at 6000 feet, just east of Cloncurry in
north-western Queensland, we saw a Black-necked Stork (Ephippiorhynchus
asiaticus) beside us and a little below (50 ft?). We had apparently upset
its rhythm in flight, for it had its legs hanging and was flapping a bit
irregularly. Our plane passed and I did not see it regain its rhythm again.

Gloria Glass
Toowoomba Queensland