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Pick two dinosaurs to see them side by side. Ranges are shown as published; missing values say Unknown.

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Drawn to one scale, overlapping on a shared ground line, with a 1.8 m human on the right. Diplodocus carnegii: 26 m long · 3.2 m hip height. Apatosaurus ajax: 23 m long · 3.6 m hip height. Diplodocus carnegii is 1.1× the length of Apatosaurus ajax.Silhouettes: Diplodocus carnegii · Scott Hartman, CC BY 3.0, via PhyloPic · CC BY 3.0; Apatosaurus ajax · Elihu Guzmán Arroyo, CC BY 4.0, via PhyloPic · CC BY 4.0; Human · Cagri CEVRIM · CC0 1.0

Fred Wierum, CC BY-SA 4.0, via Wikimedia Commons (unmodified except resizing) · CC BY-SA 4.0

Diplodocus carnegii

Period: Jurassic· Kimmeridgian
Age: 154.8–143.1 Ma
Diet: Herbivore
Length: 24–26 m
Height: 3–3.4 m
Mass: 12–14.8 t
Found in: Morrison Formation, Wyoming, United States
Classification: Dinosauria › Saurischia › Sauropodomorpha › Sauropoda › Diplodocoidea › Diplodocidae › Diplodocinae › Diplodocus › Diplodocus carnegii
Year described: 1901

TotalDino, CC0, via Wikimedia Commons · CC0 1.0

Apatosaurus ajax

Period: Jurassic· Kimmeridgian
Age: 154.8–143.1 Ma
Diet: Herbivore
Length: 21–23 m
Height: 3.3–4 m
Mass: 16.4–22.4 t
Found in: Morrison Formation, Colorado, Utah, Wyoming, United States
Classification: Dinosauria › Saurischia › Sauropodomorpha › Sauropoda › Diplodocoidea › Diplodocidae › Apatosaurinae › Apatosaurus › Apatosaurus ajax
Year described: 1877