Giants of deep time
Largest Flying Animals Ever: Wingspan Estimates
Compare the giant pterosaur Quetzalcoatlus with Pelagornis, Argentavis and Teratornis. Published wingspan estimates show both the scale of these animals and the uncertainty in reconstructing flight.
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How this list was selected
Selected large flyers with published wingspan estimates, ordered by the upper cited value. Ranges overlap, so this does not establish a definitive winner among birds. Argentavis uses the 7 m flight-model estimate; Teratornis spans the text estimate and model value in that paper. Wingspan is not body length or mass. Pterosaurs were flying reptiles, not birds or dinosaurs; the list is not exhaustive.
What were the biggest flying dinosaurs?
This question often points to Quetzalcoatlus, but it was a pterosaur: a flying reptile outside Dinosauria. Birds are living dinosaurs, so Pelagornis and Argentavis belong to the dinosaur branch in a way that pterosaurs do not. Compare the wingspan estimates below within each group; overlapping estimates cannot establish one definitive largest bird, and wingspan does not measure weight.
In this guide 4
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4 atlas recordsAbout 68–66 million years ago
Quetzalcoatlus
Quetzalcoatlus northropi
Estimated wingspan≈ 10–11 mOne of the largest known flying animals stood as tall as a giraffe on the ground.
Inland wetlands of North America
Natural History Museum of Los Angeles County — Pterosaurs ↗
About 25–24 million years ago
Sanders's Pelagornis
Pelagornis sandersi
Estimated wingspan≈ 6.4–7.4 mIts estimated wingspan exceeded six meters, while bony pseudoteeth lined a beak adapted to slippery marine prey.
North Atlantic coasts and open ocean · Southeastern USA
The Charleston Museum — Pelagornis sandersi ↗
About 8–6 million years ago
Argentavis
Argentavis magnificens
Estimated wingspan≈ 7 mArgentavis magnificens was a giant bird from Late Miocene Argentina. Its flight is reconstructed from incomplete fossils and aerodynamic models, not observations of a living bird.
South America · Present-day Argentina
Chatterjee et al. (2007), PNAS — Argentavis flight model ↗
About 2.5 million–11,000 years ago
Teratornis
Teratornis merriami
Estimated wingspan≈ 3.5–3.93 mA large soaring bird with an estimated 11–12 ft wingspan; its diet involved more than a simple vulture comparison.
Grassland and open woodland · North America
Chatterjee et al. (2007), PNAS — text and Table 1 ↗
