Apatosaurus possessed skeletal features that show it was terrestrial, meaning it lived on land. Its bones could support its great weight, and studies of fossil footprints revealed that its toes were covered with horny pads like those of an elephant. Its ribcage was also heart-shaped in cross-section, like that of an elephant, rather than barrel-shaped like the ribcage of an amphibious hippopotamus. These lines of evidence indicate that Apatosaurus was not an aquatic dinosaur.
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