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That's for sure, and I kind of wonder at this sighting. Those geese would have to be flapping like mad to keep aloft in air that thin, never mind the breathing problem. It's hard to see how they could generate enough lift.
We used to have a creationist poster (medved) who was often asking "Birds from dinosaurs!? How could a dinosaur ever evolve a bird's flow-through lungs?" This is basically it. Dinosaurs, not birds, evolved the lungs back when being at sea level was like being at 20,000 feet now. Lots of other things including the ancestors of mammals were dropping like flies or barely hanging on at the time, but dinosaurs blundered onto the key.