Apatosaurus excelsius (
Jurassic, 140 million years) was one of the largest dinosaurs that ever existed, with a length of up to 35 m. Until recently it was called
Brontosaurus. Like his relative
Diplodocus,
Apatosaurus was a grazing animal with a very long neck, and a long tail as a counterweight. Fossils of this animal were found in Nine Mile Quarry and Bone Cabin Quarry in Wyoming.
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