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An albatross has half the wingspan and 1/3 the weight of these monsters.

Albatrosses are not even the largest flying birds alive today. The Andean Condor holds that crown.

It is actually the great bustard if you consider weight not wingspan - https://www.wikiwand.com/en/Great_bustard

Wandering Albatross have a wider wingspan than Andean Condors on average if I am not mistaken

Huh. https://en.wikipedia.org/wiki/Wandering_albatross confirms. Longer wingspan (by 1 foot), but lighter bird.