 Comparisons between the scleral rings of diplodocines and modern birds and reptiles suggest that they may have been cathemeral, active throughout the day at short intervals.Marsh and then Hatcher assumed that the animal was aquatic, because of the position of its nasal openings at the apex of the cranium.Similar aquatic behavior was commonly depicted for other large sauropods, such as "Brachiosaurus" and "Apatosaurus".