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Dinosaur Apatosaurus And Human Size Comparison. An Illustration Of The Dinosaur Apatosaurus (Formerly Known As Brontosaurus) Depicted Alongside An Average Height Human. Apatosaurus Is An Extinct Genus Of Sauropod Dinosaur That Lived In North America During The Late Jurassic Period. It Had An Average Length Of 22.8 M (75 Ft) And A Mass Of At Least 16.4 Metric Tons.