Heptasteornis: quick facts

Because it is only known from parts of leg bones, this small theropod was first taken to be a large bird and later, more specifically, a large owl (hence its name).

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Reference background: Natural History Museum, London — Dinosaurs; Smithsonian National Museum of Natural History — Dinosaurs; American Museum of Natural History — Dinosaurs & Fossils. Figures are typical published ranges; taxonomy follows the source era and modern consensus is noted where it differs. See our sources & fact-check policy.