Apatosaurus is considered to be one of the largest land animals of all time, it had four massive and pillarlike legs, and its tail was extremely long and whiplike. Much discussion has centred on whether Apatosaurus and related forms were able to support their great bulk on the land or were forced to adopt aquatic habits. Many lines of evidence, including skeletal structure and footprints, show that Apatosaurus and all sauropods were terrestrial, like elephants. No skeletal features are indicative of an aquatic existence, and analyses suggest that the dinosaur’s bones could easily have supported its great weight.