What bird species nest at a higher altitude than any other bird?

Andean condor
Alpine chough
Rüppell's vulture
Bearded vulture
The Alpine chough breeds in mountains from Spain eastwards through southern Europe and the Alps across Central Asia and the Himalayas to western China. A high-altitude species has nested at 6,500 m, higher than any other bird species, and has been observed following mountaineers ascending Mount Everest at an altitude of 8,200 m.
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Answers by country

Andean condor
Alpine chough
Rüppell's vulture
Bearded vulture
answers
flagAustralia
11%
85%
3%
0%
27
flagGreece
28%
57%
7%
7%
14
flagAustria
42%
42%
4%
4%
21
flagIndia
21%
40%
22%
10%
66
flagthe United Kingdom
38%
35%
11%
11%
34
flagthe United States
48%
33%
7%
11%
54
flagPoland
35%
31%
15%
17%
991
flagPakistan
40%
30%
30%
0%
10
flagGermany
50%
23%
10%
12%
55